feat: add json content generator

package.json

@@ -11,10 +11,11 @@
     "hexo-generator-archive": "^0.1.0",
     "hexo-generator-category": "^0.1.0",
     "hexo-generator-index": "^0.1.0",
+    "hexo-generator-json-content": "^2.1.2",
     "hexo-generator-tag": "^0.1.0",
     "hexo-renderer-ejs": "^0.1.0",
     "hexo-renderer-marked": "^0.2.4",
     "hexo-renderer-stylus": "^0.2.0",
     "hexo-server": "^0.1.2"
   }
-}
+}

themes/icarus

@@ -1 +1 @@
-Subproject commit fbfc2cc3d6aabaf5f33c29987b4ed6aba826850f
+Subproject commit f4b54fcfd1149081199939bed13f1c3d92dc46b5