adding showcase and contribution in navigation

Author: officialrajdeepsingh

docs/src/pages/_meta.json

@@ -6,5 +6,14 @@
   "docs": {
     "type": "page",
     "title": "Documentation"
+  },
+  "showcase": {
+    "type": "page",
+    "title": "Showcase"
+  },
+  "contribution": {
+    "type": "page",
+    "title": "Contribution",
+    "href": "https://github.com/frontendweb3/section-blog-theme/contribute"
   }
-}
+}