breaking changes: Open_Graph_meta 設置更改，可配置其它參數

feature: 更新 Facebook sdk 到 v15
improvement: 更新 plugins.yml
Remove: 移除 meta keywords

source/js/main.js

@@ -477,7 +477,7 @@ document.addEventListener('DOMContentLoaded', function () {
       // handle some cases
       typeof utterancesTheme === 'function' && utterancesTheme()
       typeof changeGiscusTheme === 'function' && changeGiscusTheme()
-      typeof FB === 'object' && window.loadFBComment()
+      typeof FB === 'object' && window.loadFBComment && window.loadFBComment()
       typeof runMermaid === 'function' && window.runMermaid()
     },
     showOrHideBtn: (e) => { // rightside 點擊設置 按鈕 展開