breaking changes: 移除博天api

breaking changes: 移除 waline 的 avatar 和 avatar cdn 配置
feat: anchor 不再限制 post 頁開啟，可以在任何頁面開啟
feat: 文章標題支持點擊跳轉到此標題開始閲讀 closed #653
feat: toc可以設置全部展開 closed #709
feat: 增加 新的評論系統 giscus
feat: 支持新的評論名寫法，主題會處理評論名字大小寫，舊的會兼容
feat: 友情鏈接列表增加 fetch url 獲取
improvement: 鼠標移到最新評論內容，增加 title 顯示
fix: 修復 rightside 遮擋內容，導致內容無法點擊的 bug
fix: 修復 mermaid 在某些頁面（有元素 id 為 mermaid 時） 會無法加載的 bug
fix: 修復 搜索框不會自動 focus 的 bug

layout/includes/third-party/comments/giscus.pug

@@ -0,0 +1,49 @@
+- const { repo, repo_id, category_id, option } = theme.giscus
+- const themes = theme.giscus.theme
+script.
+  function loadGiscus () {
+    let nowTheme = document.documentElement.getAttribute('data-theme') === 'dark' ? '!{themes.dark}' : '!{themes.light}'
+
+    const config = Object.assign({
+      src: '!{theme.CDN.giscus}',
+      'data-repo': '!{repo}',
+      'data-repo-id': '!{repo_id}',
+      'data-category-id': '!{category_id}',
+      'data-mapping': 'pathname',
+      'data-theme': nowTheme,
+      'data-reactions-enabled': '1',
+      crossorigin: 'anonymous',
+      async: true
+    },!{JSON.stringify(option)})
+
+    let ele = document.createElement('script')
+    for (let key in config) {
+      ele.setAttribute(key, config[key])
+    }
+    document.getElementById('giscus-wrap').insertAdjacentElement('afterbegin',ele)
+  }
+
+  function changeGiscusTheme () {
+    const theme = document.documentElement.getAttribute('data-theme') === 'dark' ? '!{themes.dark}' : '!{themes.light}'
+
+    function sendMessage(message) {
+      const iframe = document.querySelector('iframe.giscus-frame');
+      if (!iframe) return;
+      iframe.contentWindow.postMessage({ giscus: message }, 'https://giscus.app');
+    }
+
+    sendMessage({
+      setConfig: {
+        theme: theme
+      }
+    });
+  }
+
+  if ('!{theme.comments.use[0]}' === 'Giscus' || !!{theme.comments.lazyload}) {
+    if (!{theme.comments.lazyload}) btf.loadComment(document.getElementById('giscus-wrap'), loadGiscus)
+    else loadGiscus()
+  } else {
+    function loadOtherComment () {
+      loadGiscus()
+    }
+  }

layout/includes/third-party/comments/index.pug

@@ -33,6 +33,8 @@ hr
             #twikoo-wrap
           when 'Waline'
             #waline-wrap
+          when 'Giscus'
+            #giscus-wrap
           when 'Facebook Comments'
             .fb-comments(data-colorscheme = theme.display_mode === 'dark' ? 'dark' : 'light'
                         data-numposts= theme.facebook_comments.pageSize || 10

layout/includes/third-party/comments/js.pug

@@ -16,5 +16,7 @@ each name in theme.comments.use
       !=partial('includes/third-party/comments/twikoo', {}, {cache: true})
     when 'Waline'
       !=partial('includes/third-party/comments/waline', {}, {cache: true})
+    when 'Giscus'
+      !=partial('includes/third-party/comments/giscus', {}, {cache: true})
     when 'Facebook Comments'
       !=partial('includes/third-party/comments/facebook_comments', {}, {cache: true})