Added pages and routes for Groups by tag and category

• Added:
- pages and routes for Groups by tag and category

app/javascript/gabsocial/utils/unslugify.js

@@ -0,0 +1,7 @@
+// https://github.com/danny-wood/unslugify/blob/master/index.js
+export default function unslugify(text) {
+  const result = `${text}`.replace(/\-/g, " ");
+  return result.replace(/\w\S*/g, function (txt) {
+    return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();
+  });
+}