Add a general article on osu! forums. Add forum-specific stubs

wiki/Community/Forum/Feature_Requests/en.md

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+---
+stub: true
+---
+
+# Feature Requests
+
+[**Feature Requests**](https://osu.ppy.sh/community/forums/4) is a forum created for suggestions regarding osu!. Users can promote feature requests and increase their priority by [spending stars](/wiki/Modding/Star_priority) obtained with [osu!support](/wiki/osu!support).<!-- TODO: part of Modding/Star_priority belongs here -->
+
+Nowadays, the Feature Requests forum is obsolete, and has been mostly replaced by the [GitHub Discussions](https://github.com/ppy/osu/discussions) flow.

wiki/Community/Forum/Help/en.md

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+---
+stub: true
+---
+
+# Help
+
+*See also: [Help Centre](/wiki/Help_Centre)*
+
+<!-- TODO: mention issue labels? -->
+
+[**Help**](https://osu.ppy.sh/community/forums/5) is a forum where players can receive technical support from the [Support Team](/wiki/People/The_Team/Support_Team) members, as well as regular users.

wiki/Community/Forum/Modding_Queues/en.md

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+---
+stub: true
+---
+
+# Modding Queues
+
+<!-- TODO: this needs to be linked from other related articles, for example, "how to get mods" -->
+
+[**Modding Queues**](https://osu.ppy.sh/community/forums/60) is a forum dedicated to [beatmap review](/wiki/Modding) requests, or mods. It consists of forum threads, or *queues* belonging to different modders and mappers. Every queue has individual requirements and limits on obtaining the mods, which must be respected by its visitors in order to receive a mod.
+
+## Queue rounds
+
+Before the start of every round, the queue's owner posts a short announcement, which typically contains:
+
+- The number of maps that may be accepted in this round
+- Requirements specific to this round
+- Whether the mods are regular (normal), or [a mod in return](/wiki/Modding/Mod_for_mod) is expected
+- Other information relevant to modding
+
+Once enough requests are left in the thread, the modder will post a short message saying which beatmaps were accepted for modding. After that, the queue is said to be closed until the next round.

wiki/Community/Forum/Off-Topic/en.md

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+---
+stub: true
+---
+
+# Off-Topic
+
+<!-- TODO: A LOT could be written here: https://github.com/ppy/osu-wiki/issues/2804 -->
+
+[**Off-Topic**](https://osu.ppy.sh/community/forums/52) is a forum for anything that doesn't belong to other osu! forums.

wiki/Community/Forum/en.md

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+---
+tags:
+  - forums
+  - subforum
+---
+
+# Forum
+
+*See also: [Internet forum](https://en.wikipedia.org/wiki/Internet_forum)*
+
+[The osu! **forums**](https://osu.ppy.sh/community/forums) are a place for conversations where messages are grouped by subjects, and no quick response is expected. The discussions are searchable, stored forever, and may be revisited at any time, which makes them different from the near-instant messages in [osu! chat](/wiki/Community/Internet_Relay_Chat). As a result, forum messages are longer, contain more information, and typically provide more details than chat messages would.
+
+The osu! forums provide [features](#features) similar to most internet forums: [BBCode](/wiki/BBCode) markup, polls, pins and subscriptions, private messages, and [moderation](#moderation).
+
+## Structure
+
+Each of the osu! forums contains a variety of topics, called **threads**, as well as smaller categories, or **subforums**. Most of the forums are English only, but there also exists a number of [language-specific](https://osu.ppy.sh/community/forums#forum-23) forums for local communities that are large enough.
+
+While some forums, such as [Mapping Discussion](https://osu.ppy.sh/community/forums/56), have specific requirements or guidelines, all of them follow [the community rules](/wiki/Rules).
+
+## Roles and user groups
+
+Some users may belong to one or several custom groups, based on their community tasks, access rights, or past activity. The list of user groups can be found at [The Team § User groups](/wiki/People/The_Team#user-groups).
+
+In addition to profile badges provided by group membership, users may have [custom forum titles](/wiki/User_title) displayed under the avatar in each of their posts.
+
+### Moderation
+
+*See also: [Reporting bad behaviour § Forum](/wiki/Reporting_Bad_Behaviour#forum)*
+
+[Moderators](/wiki/People/The_Team/Global_Moderation_Team) are users who keep the forums clean and appropriate, and answer concerns related to that. Moderators can edit or delete inappropriate posts or threads, pin threads and move them between different forums, and temporarily prevent offenders from posting by [silencing](/wiki/Silence) them.
+
+## Features
+
+### Post features
+
+- Forum posts, as opposed to chat messages, can be **formatted** using [BBCode](/wiki/BBCode), a lightweight markup language. They can also contain YouTube videos, or embed images or audio hosted outside of the forums. 
+
+### Thread features
+
+- Threads may have **polls** in their opening posts, with up to 10 options.
+- Threads may have **custom covers** (maximum dimensions are 2400×580).
+- Users may **subscribe to threads** and receive updates via e-mail or [website notifications](https://osu.ppy.sh/notifications).
+
+### Forum features
+
+- If a thread contains an announcement, forum rules, or is useful to the majority of the visitors, moderators may **pin** it, placing it at the top of the thread listing.
+- Users can exchange private messages, which are available [in-game](/wiki/Chat_Console) and [on the website](https://osu.ppy.sh/community/chat).
+
+## Special forums
+
+Some of the forums have different purposes that are not limited to discussion. As a result, they have extra rules and/or technical capabilities.
+
+- [Help](/wiki/Community/Forum/Help): technical support from the [Support Team](/wiki/People/The_Team/Support_Team) and regular users.
+- [Feature Requests](/wiki/Community/Forum/Feature_Requests): suggestions for osu! development.
+- [Modding Queues](/wiki/Community/Forum/Modding_Queues): beatmap reviews done by other mappers and modders.
+- [Off-Topic](/wiki/Community/Forum/Off-Topic): the place for the not-so-logical discussions.
+- [Abandoned Wasteland](/wiki/Community/Forum/Abandoned_Wasteland): the storage for useless threads.
+
+Additionally, there are other forums similar to Abandoned Wasteland, which serve technical or managerial purposes and are therefore hidden from the general public.
+
+## History
+
+[The first public forum post](https://osu.ppy.sh/community/forums/topics/2) is dated 2011-08-27 and belongs to [peppy](/wiki/People/peppy). During that time, the osu! website used [phpBB](https://en.wikipedia.org/wiki/PhpBB) as its forum engine, which over the years has been significantly expanded to suit the game and community's needs. Some of its customisations included:
+
+- Integration with the [beatmap submission system](/wiki/Submission)
+- The [kudosu](/wiki/Kudosu) and [beatmap ranking](/wiki/Beatmap_ranking_procedure) systems
+- [Help](/wiki/Community/Forum/Help) and [Feature Requests](/wiki/Community/Forum/Feature_Requests) forums
+- [osu!supporter](/wiki/osu!supporter) and user pages
+
+After the new osu! website was brought up and running, phpBB had been slowly phased out in favour of the custom forum engine used today.

wiki/redirect.yaml

@@ -87,11 +87,21 @@
 "difficulty":                        "Beatmap/Difficulty"
 "difficulties":                      "Beatmap/Difficulty"
 
+
 "community_mentorship_program": "Community/Community_Mentorship_Program"
-"project_loved":                "Community/Project_Loved"
+"AW":                           "Community/Forum/Abandoned_Wasteland"
+"abandoned_wasteland":          "Community/Forum/Abandoned_Wasteland"
+"forum":                        "Community/Forum"
+"forums":                       "Community/Forum"
+"modding_queue":                "Community/Forum/Modding_Queues"
+"modding_queues":               "Community/Forum/Modding_Queues"
+"OT":                           "Community/Forum/Off-Topic"
+"off-topic":                    "Community/Forum/Off-Topic"
+"offtopic":                     "Community/Forum/Off-Topic"
 "osu!_community_meetings":      "Community/osu!_community_meetings"
 "osu!dev_discord_server":       "Community/osu!dev_Discord_server"
 "organisations":                "Community/Organisations"
+"project_loved":                "Community/Project_Loved"
 "osu!talk":                     "Community/Video_series/osu!talk"
 "osu!mapping":                  "Community/Video_series/osu!mapping"