[Glitch] Add trends UI with admin and user settings

Port 9072fe5ab6 to glitch-soc

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

app/javascript/flavours/glitch/util/initial_state.js

@@ -33,5 +33,6 @@ export const forceSingleColumn = getMeta('advanced_layout') === false;
 export const useBlurhash = getMeta('use_blurhash');
 export const usePendingItems = getMeta('use_pending_items');
 export const useSystemEmojiFont = getMeta('system_emoji_font');
+export const showTrends = getMeta('trends');
 
 export default initialState;