Replaces this section on the `/about` page:

with:

I will replace and fix the colors of the buttons after #15 is merged.
Reviewed-on: https://codeberg.org/vlw/vlw.se/pulls/14
This PR features a lot of text revisions, updated references to GitHub with Codeberg and more.
Reviewed-on: https://codeberg.org/vlw/vlw.se/pulls/4
Co-authored-by: Victor Westerlund <victor.vesterlund@gmail.com>
Co-committed-by: Victor Westerlund <victor.vesterlund@gmail.com>