[FEAT] Remove add organization on dashboard switcher

- Similair to #2593 that removed subtle add button in a place where it's
strictly not needed.
- Remove the "Add organization" item in the 'context dashboard switcher' dropdown.

templates/user/dashboard/navbar.tmpl

@@ -35,11 +35,6 @@
 							</a>
 						{{end}}
 					</div>
-					{{if .SignedUser.CanCreateOrganization}}
-					<a class="item" href="{{AppSubUrl}}/org/create">
-						{{svg "octicon-plus"}}&nbsp;&nbsp;&nbsp;{{ctx.Locale.Tr "new_org"}}
-					</a>
-					{{end}}
 				</div>
 			</div>
 		</div>