[Glitch] Improvements to the single column layout

app/javascript/flavours/glitch/actions/compose.js

app/javascript/flavours/glitch/components/icon_with_badge.js

...ascript/flavours/glitch/features/follow_requests/index.js

...ascript/flavours/glitch/features/getting_started/index.js

...glitch/features/ui/components/follow_requests_nav_link.js

...ript/flavours/glitch/features/ui/components/list_panel.js

...lavours/glitch/features/ui/components/navigation_panel.js

...itch/features/ui/components/notifications_counter_icon.js