feat: preconnect 根據 CDN 配置引入

feat: 移除 anchor 的 button, 直接點擊標題跳轉
feat: 更改 headline 的 hover 效果
improvement: tabs content 裏最後一個元素 margin-bottom 改為 0
fix: float 浮動佈局導致評論寬度異常的 bug

layout/includes/head/noscript.pug

@@ -1,10 +0,0 @@
-noscript. 
-  <style type="text/css">
-    #nav {
-      opacity: 1
-    }
-    #recent-posts time,
-    #post-meta time {
-      display: inline !important
-    }
-  </style>

layout/includes/head/preconnect.pug

@@ -1,4 +1,20 @@
-link(rel="preconnect" href="//cdn.jsdelivr.net")
+-
+  const { internal_provider, third_party_provider, custom_format } = theme.CDN
+  const providers = {
+    'jsdelivr': '//cdn.jsdelivr.net',
+    'cdnjs': '//cdnjs.cloudflare.com',
+    'unpkg': '//unpkg.com',
+    'custom': custom_format.match(/^((https?:)?(\/\/[^/]+)|([^/]+))(\/|$)/)[1]
+  }
+-
+
+if internal_provider === third_party_provider && internal_provider !== 'local'
+  link(rel="preconnect" href=providers[internal_provider])
+else 
+  if internal_provider !== 'local'
+    link(rel="preconnect" href=providers[internal_provider])
+  if third_party_provider !== 'local'
+  link(rel="preconnect" href=providers[third_party_provider])
 
 if theme.google_analytics
   link(rel="preconnect" href="//www.google-analytics.com" crossorigin='')