[Glitch] Change about page to be mounted in the web UI

Port 1bd00036c2 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/styles/index.scss

@@ -2,7 +2,6 @@
 @import 'variables';
 @import 'styles/fonts/roboto';
 @import 'styles/fonts/roboto-mono';
-@import 'styles/fonts/montserrat';
 
 @import 'reset';
 @import 'basics';
@@ -11,7 +10,6 @@
 @import 'lists';
 @import 'modal';
 @import 'footer';
-@import 'compact_header';
 @import 'widgets';
 @import 'forms';
 @import 'accounts';