[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/components/create_post.jsx

@@ -466,20 +466,8 @@ export default class CreatePost extends React.Component {
     showShortcuts(e) {
         if ((e.ctrlKey || e.metaKey) && e.keyCode === Constants.KeyCodes.FORWARD_SLASH) {
             e.preventDefault();
-            const args = {};
-            args.channel_id = this.state.channelId;
-            args.team_id = TeamStore.getCurrentId();
-            ChannelActions.executeCommand(
-                '/shortcuts',
-                args,
-                null,
-                (err) => {
-                    this.setState({
-                        serverError: err.message,
-                        submitting: false
-                    });
-                }
-            );
+
+            GlobalActions.showShortcutsModal();
         }
     }