Guidance needed for communities in account profiles

[marvinm2]

During a demo of editing the Markdown-based account profiles, a question came up: "how do I know which short name I fill in my personal page to make the right community show up?" as these seemed to be shortnames. Maybe having these options as comment in the .md file or some other way visible would help if someone new wants to add themselves to one or more communities.

[khanspers]

The list of community shorthands could be kept in the Academy repo and then linked to from here https://academy.wikipathways.org/stages/wp-custom-user-page/index.html (using an example).