Add polls

Port front-end parts of 230a012f00 to glitch-soc

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

@@ -16,6 +16,7 @@
 @import 'accounts';
 @import 'stream_entries';
 @import 'components/index';
+@import 'polls';
 @import 'about';
 @import 'tables';
 @import 'admin';