[PLT-3377] Open up a shortcuts dialog instead of printing help text (#7064)

* open up a shortcuts dialog instead of printing help text

* Updating UI for keyboard shortcuts modal

* update PR per PLT-7284

* fix typo error

* fix mixed up shortcut keys

* move to client side

* fix shortcuts list, remove unused function and revert server side code for autocompletion

* remove quick team switcher

webapp/stores/modal_store.jsx

@@ -32,6 +32,7 @@ class ModalStoreClass extends EventEmitter {
 
         switch (type) {
         case ActionTypes.TOGGLE_ACCOUNT_SETTINGS_MODAL:
+        case ActionTypes.TOGGLE_SHORTCUTS_MODAL:
         case ActionTypes.TOGGLE_IMPORT_THEME_MODAL:
         case ActionTypes.TOGGLE_INVITE_MEMBER_MODAL:
         case ActionTypes.TOGGLE_LEAVE_TEAM_MODAL: