trim settings-site to match stripped bot

- delete public/js/notifications.js (521 LOC)
- remove notifications/patterns/surge/chat/priority/bosscord/accountinfo/threads UI sections
- remove 3 /api/notifications/* proxy routes from server.js
- untrack settings-site backup files from git
- ~926 LOC removed from settings-site

settings-site/public/js/app.js

@@ -13,7 +13,6 @@
       document.getElementById('bot-status-dot').className = 'dot online';
       document.getElementById('bot-status-text').textContent = 'Connected';
       Fields.populateFields(config);
-      Notifications.initNotificationsEditor(config);
       Fields.initSmartSelects(config);
     } catch (e) {
       document.getElementById('bot-status-dot').className = 'dot offline';