De-list/Remove Keybase (#1951)

* Update instant-messenger.html

* Update teamchat.html

See #1951

* Remove Keybase

* Remove Keybase References

Co-authored-by: Freddy Marsden <hello@freddym.xyz>
Co-authored-by: Jonah Aragon <jonah@triplebit.net>

pages/about.html

@@ -155,7 +155,7 @@ emeritus=true
     <p><a href="https://github.com/privacytools/privacytools.io/issues"><i class="fab fa-github fa-lg fa-fw"></i> Open an issue on GitHub</a></p>
     <p><a href="https://www.reddit.com/r/privacytoolsIO/"><i class="fab fa-reddit fa-lg fa-fw"></i> Suggest something new on our subreddit</a></p>
     <p>For complete transparency, software and providers will only be considered for this website after discussions take place on our GitHub issue tracker. We of course don't make any changes in secret.</p>
-    <p>Join our Matrix room at <code>#general:privacytools.io</code> or join the <a href="https://keybase.io/team/privacytools_io">privacytools_io Keybase team</a> to chat with us and other members about this site and privacy in general! If you need a Matrix account, you can sign up with our own homeserver (<code>https://chat.privacytools.io</code>) using <a href="https://riot.privacytools.io">Riot</a>.</p>
+    <p>Join our Matrix room at <code>#general:privacytools.io</code> to chat with us and other members about this site and privacy in general! If you need a Matrix account, you can sign up with our own homeserver (<code>https://chat.privacytools.io</code>) using <a href="https://riot.privacytools.io">Riot</a>.</p>
     <p>You can also email the team at <a itemprop="email" href="mailto:support@privacytools.io">support@privacytools.io</a> and find us on <a itemprop="sameAs" href="https://twitter.com/privacytoolsIO">Twitter</a> and <a itemprop="sameAs" href="https://social.privacytools.io/@privacytools">Mastodon</a>.</p>
     <link itemprop="sameAs" href="https://blog.privacytools.io">
     <link itemprop="sameAs" href="https://www.youtube.com/channel/UCen3taxHtzByXV8Da73B1Vg">