Remove Mastodon CoC msg for custom guidelines

When an admin makes their own Community Guidelines page through the page editor, the message stating "Originally adapted from the Mastodon Code of Conduct" still appears, which may no longer be accurate in such a scenario (as the admin has probably written their own community guidelines in that case.) This edit simply removes that line.

resources/views/site/help/community-guidelines.blade.php

@@ -11,7 +11,6 @@
     {!!$page->content!!}
     <hr>
     <p class="">This document was last updated {{$page->created_at->format('M d, Y')}}.</p>
-    <p class="">Originally adapted from the <a href="https://mastodon.social/about/more">Mastodon</a> Code of Conduct.</p>
   </div>
   @else
   <div>