Fix broken asset URLs

Author: loichyan

package.json

@@ -13,7 +13,6 @@
   },
   "dependencies": {
     "hexo": "^4.2.1",
-    "hexo-asset-image": "^1.0.0",
     "hexo-cli": "^3.1.0",
     "hexo-deployer-git": "^2.1.0",
     "hexo-generator-archive": "^1.0.0",