Some update for 2021-11-21

[Raddeck]

I decided to delete the "announcements forum", as there is no reason to repeat what is already on the Vimfamy Patreon page.
But if you think it's important, I can put it back.

I also deleted the "introduction" and "off topics" forums.
Reasons:
introduction -->you can do this on your profile page.
Off topics --> may come back soon

I made several changes to the site itself.
- Added prefixes in several categories
- Optimization for search engines
- Clarification of submission rules
- Added 1 new command (setRaceGenerated) in the documentation
- Added 1 new condition (isEthnic) in the documentation
- Design corrections
- Added about 18 new questions in the F.A.Q

If you have any questions or suggestions, please let me know. I will be happy to help you.