feat: 重構本地搜索

feat: Algolia 搜索，點擊文章內容也會跳轉到相應頁面
fix: 修復 fullpage loading 顯示滾動條的 bug close #1235
fix: 修復 safari 下，搜索內容被系統搜索框遮擋的 bug
improvement: 手機 safari 橫屏時，網頁全屏幕顯示
improvement: 當沒有開啟 beautify 時， hr 顯示默認的樣式

_config.yml

@@ -56,11 +56,15 @@ algolia_search:
 # Local search
 local_search:
   enable: false
+  # Preload the search data when the page loads.
   preload: false
+  # Show top n results per article, show all results by setting to -1
+  top_n_per_article: 1
+  # Unescape html strings to the readable one.
+  unescape: false
   CDN:
 
 # Docsearch
-# https://docsearch.algolia.com/
 docsearch:
   enable: false
   appId:
@@ -777,7 +781,7 @@ rightside_item_order:
 medium_zoom: false
 
 # fancybox
-# http://fancyapps.com/fancybox/3/
+# https://fancyapps.com/fancybox/
 fancybox: true
 
 # Tag Plugins settings (標籤外掛)