feat: 不蒜子可配置 CDN closed #1132

feat: gallery 標簽外掛增加圖片懶加載，增加 lazyload rowHeight 和 limit 屬性配置
feat: 可設置固定導航欄 closed #1150
fix: 修復開啟懶加載後，再使用 flink_url 的方式引入友鏈數據，友鏈頭像有可能不顯示的 bug closed #1146
fix: 修復閲讀模式下，代碼塊的背景顏色仍顯示彩色背景的 bug (自定義代碼塊) closed #1139
improvement: 搜索結果換行時不會拆分單詞顯示
improvement: 優化搜索結果顯示滾動條位置
improvement: css/js 優化

layout/includes/header/nav.pug

@@ -1,21 +1,22 @@
-nav#nav
+- const isFixedClass = theme.nav.fixed ? 'fixed' : ''
+nav#nav(class=isFixedClass)
   span#blog-info
     a(href=url_for('/') title=config.title)
-      if theme.nav_info.logo
-        img.site-icon(src=url_for(theme.nav_info.logo))
-      if theme.nav_info.display_title
+      if theme.nav.logo
+        img.site-icon(src=url_for(theme.nav.logo))
+      if theme.nav.display_title
         span.site-name=config.title
     
   #menus
     if (theme.algolia_search.enable || theme.local_search.enable)
       #search-button
-        a.site-page.social-icon.search
+        a.site-page.social-icon.search(href="javascript:void(0);")
           i.fas.fa-search.fa-fw
           span=' '+_p('search.title')
     !=partial('includes/header/menu_item', {}, {cache: true})
 
     #toggle-menu
-      a.site-page
+      a.site-page(href="javascript:void(0);")
         i.fas.fa-bars.fa-fw