chore(deps-dev): bump vitepress from 0.14.1 to 0.15.3 (#295)

Author: dependabot[bot]

package-lock.json

@@ -95,7 +95,7 @@
     "lodash": "^4.17.20",
     "ts-node": "^10.0.0",
     "typescript": "^4.0.5",
-    "vitepress": "^0.14.0",
+    "vitepress": "^0.15.3",
     "vue": "^3.0.2",
     "vue2": "npm:vue@2"
   },