feat(dev): add documentation cache config

ngsw-config.json

@@ -19,6 +19,16 @@
     }
   ],
   "dataGroups": [
+    {
+      "name": "documentation",
+      "urls": ["/doc/**"],
+      "cacheConfig": {
+        "strategy": "freshness",
+        "maxSize": 10000,
+        "maxAge": "12h",
+        "timeout": "5s"
+      }
+    },
     {
       "name": "ghost",
       "urls": ["/blog/**"],