更新依赖项版本，优化主题配置，移除冗余代码

Author: AndersonHJB

package.json

@@ -11,16 +11,16 @@
     "docs:update-package": "pnpm dlx vp-update"
   },
   "devDependencies": {
-    "@vuepress/bundler-vite": "2.0.0-rc.19",
-    "@vuepress/plugin-watermark": "2.0.0-rc.67",
-    "katex": "^0.16.15",
+    "@vuepress/bundler-vite": "2.0.0-rc.20",
+    "@vuepress/plugin-watermark": "2.0.0-rc.80",
+    "katex": "^0.16.21",
     "mermaid": "^11.4.1",
     "recaptcha-v3": "^1.11.3",
-    "sass-embedded": "^1.83.0",
+    "sass-embedded": "^1.85.1",
     "vue": "^3.5.13",
-    "vuepress": "2.0.0-rc.19",
+    "vuepress": "2.0.0-rc.20",
     "vuepress-plugin-copyright2": "2.0.0-rc.18",
-    "vuepress-theme-hope": "2.0.0-rc.66"
+    "vuepress-theme-hope": "2.0.0-rc.73"
   },
   "dependencies": {
     "@waline/client": "2.15.8"