chore: remove unused dependencies

package.json

@@ -75,9 +75,7 @@
     "npm-run-all": "^4.1.5",
     "postcss-loader": "^3.0.0",
     "prettier": "^1.18.2",
-    "recursive-readdir": "^2.2.2",
     "sass-loader": "^7.3.1",
-    "sharp": "^0.23.0",
     "standard-version": "^7.0.0",
     "svg2png": "^4.1.1",
     "vue-loader": "^15.7.1",