feat(page): add custom page library support (css and js) (#357)

exampleSite/config.toml

@@ -920,6 +920,19 @@ enableEmoji = true
         label = ""
         lightTheme = "github-light"
         darkTheme = "github-dark"
+    # Third-party library config
+    # 第三方库配置
+    [params.page.library]
+      [params.page.library.css]
+        # someCSS = "some.css"
+        # located in "assets/" 位于 "assets/"
+        # Or 或者
+        # someCSS = "https://cdn.example.com/some.css"
+      [params.page.library.js]
+        # someJavascript = "some.js"
+        # located in "assets/" 位于 "assets/"
+        # Or 或者
+        # someJavascript = "https://cdn.example.com/some.js"
     # SEO config
     # SEO 配置
     [params.page.seo]