[MM-36428][MM-36434][MM-36435] Keyboard navigation and menu updates for new tab/dropdown layout (#1695)

* [MM-36428][MM-36434][MM-36435] Keyboard navigation and menu updates for new tab/dropdown layout

* Shortcuts for Windows/Linux

* Update config.yml

* Fixed up the shortcuts

* Fixed the new server modal popping up where there are GPO teams only

src/renderer/css/components/TeamDropdownButton.scss

@@ -7,7 +7,11 @@
     align-items: center;
     font-family: Open Sans;
 
-    &:hover {
+    &.disabled {
+        opacity: 0.5;
+    }
+
+    &:not(.disabled):hover {
         background-color: #f4f4f4;
 
         .TeamDropdownButton__badge-count, .TeamDropdownButton__badge-unreads {
@@ -15,7 +19,7 @@
         }
     }
 
-    &:focus, &.isMenuOpen {
+    &:not(.disabled):focus, &.isMenuOpen {
         background-color: #fff;
 
         .TeamDropdownButton__badge-count, .TeamDropdownButton__badge-unreads {