chore(deps): update dependency @vuepress/theme-default to v2.0.0-rc.91 (#42)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

docs/package-lock.json

@@ -32,7 +32,7 @@
     "@vuepress/bundler-vite": "2.0.0-rc.20",
     "@vuepress/plugin-google-analytics": "2.0.0-rc.80",
     "@vuepress/plugin-register-components": "2.0.0-rc.82",
-    "@vuepress/theme-default": "2.0.0-rc.90",
+    "@vuepress/theme-default": "2.0.0-rc.91",
     "sass-embedded": "^1.86.0",
     "vuepress": "2.0.0-rc.20"
   },