Add require login feature to see gists

templates/base/base_header.html

@@ -66,7 +66,7 @@
                                 </svg>
                             </a>
                         {{ else }}
-                            {{ if not .signupDisabled }}
+                            {{ if not .DisableSignup }}
                             <a href="/register" class="inline-flex text-slate-300 hover:bg-gray-700 hover:text-white px-3 py-2 rounded-md text-sm font-medium">
                                 <p class="text-slate-300 mr-1">Register</p>
                             </a>