Website: Update info and links on index page (#114)
    
    This simplifies the text on the spec website main page, updates old info, updates links to resources. I didn't include a link to the Matrix channel because we're still figuring it out and setting up an IRC bridge.
    
    Co-authored-by: fr33domlover <fr33domlover@riseup.net>
    Co-authored-by: 6543 <6543@noreply.codeberg.org>
    Reviewed-on: https://codeberg.org/ForgeFed/ForgeFed/pulls/114
    Reviewed-by: 6543 <6543@noreply.codeberg.org>
    Co-authored-by: fr33domlover <fr33domlover@noreply.codeberg.org>
    Co-committed-by: fr33domlover <fr33domlover@noreply.codeberg.org>