chore(tvixbolt): move from //corp to //web

Assigning copyright to the TVL community (whatever that is), and
adding AGPL-3.0-or-later license.

I also cleaned up some of the stuff on the landing page.

Change-Id: I4dbca19406e00e5105fed50e8fb64e0fcca23e3a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11013
Autosubmit: tazjin <tazjin@tvl.su>
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI

ops/modules/www/tvixbolt.tvl.su.nix

@@ -7,7 +7,7 @@
 
   config = {
     services.nginx.virtualHosts."tvixbolt.tvl.su" = {
-      root = depot.corp.tvixbolt;
+      root = depot.web.tvixbolt;
       enableACME = true;
       forceSSL = true;