Fix nonfunctional menu button in narrow view

[gitabhisingh]

There were some URL encoded chars where href was throwing errors for invalid URL, which need to be replaced with actual special characters.

1. fixed encoded URL and ID special characters from FAQ page
2. removed a warning for className in Footer page.

Note:

• I was not able to find FAQ file on zolo repo, it's in md file there. so I created a PR against master branch
• some indentation changes might have occurred due to my Prettier extension.

Closes #1508

Screenshot after changes and dev testing:

[richvdh]

@thibaultamartin my understanding is that we are not currently accepting PRs against master - is that correct?

[gitabhisingh]

@richvdh I am not able to find these HTML changes in zola repo, I see they got migrated to md file. If that's intentional then we can close this issue & PR then.

[thibaultamartin]

Hi all, just getting back from holidays. Indeed, we're currently working on a complete rewrite of the matrix.org website, and we don't accept changes against the master branch.

I will update the README accordingly, and set-up a tag system so it's more obvious where we accept help :)