chore(deps-dev): bump vitepress from 0.17.3 to 0.18.0 (#441)

Author: dependabot[bot]

package-lock.json

@@ -97,7 +97,7 @@
     "lodash": "^4.17.20",
     "ts-node": "^10.0.0",
     "typescript": "^4.0.5",
-    "vitepress": "^0.17.0",
+    "vitepress": "^0.18.0",
     "vue": "^3.0.2",
     "vue2": "npm:vue@2"
   },