fix: a few clarifications for the "Hangman" task

[Svetlaya87]

🤔 This is a ...

• 🌟 New task
• 🌐 New module
• ⚙️ Update to an existing task
• 🔧 Update to an existing module
• 🔗 Update or addition of external resources or links
• 🐛 Fix in a task or related content
• 🛠 Fix in a module or related content
• ✏️ Fixed a typo or grammatical error
• 🔗 Fixed a broken link
• ❓ Other (specify: ****____****)

Description

• Brief Overview:
• Add link to repo. Without the link it wasn't clear how to correctly create a new task in private repository.
• Add new condition for check. For example pressing alt-tab must not count as an incorrect try.
• Add new penalty to avoid the entering a large chunk or whole html code via innerHTML, insertAdjacentHTML.
• Add new links in "Useful links". In some works after the window with wrong msg opened, the letters can be entered and then, if the all letters are correct the "loss" msg changes to "win" msg in opened window. I have added the links to clarify the info about disabled elements to avoid such situations.