增加remark42的评论系统支持，config中增加对应配置。

exampleSite/config.yaml

@@ -51,6 +51,9 @@ params:
             issueTerm: pathname
             label:
             theme: preferred-color-scheme
+        remark42:
+            host: # remark42服务端地址
+            site: # remark site id参数
 
     widgets:
         enabled:

layouts/partials/comments/provider/remark42.html

@@ -0,0 +1,60 @@
+<div id="remark42">
+
+</div>
+<script>
+    var remark_config = {
+      host: "{{ .Site.Params.comments.remark42.host }}", // hostname of remark server, same as REMARK_URL in backend config, e.g. "https://demo.remark42.com"
+      site_id: '{{ .Site.Params.comments.remark42.site }}',
+      components: ['embed'], // optional param; which components to load. default to ["embed"]
+                             // to load all components define components as ['embed', 'last-comments', 'counter']
+                             // available component are:
+                             //     - 'embed': basic comments widget
+                             //     - 'last-comments': last comments widget, see `Last Comments` section below
+                             //     - 'counter': counter widget, see `Counter` section below
+    //   url: 'PAGE_URL', // optional param; if it isn't defined
+                       // `window.location.origin + window.location.pathname` will be used,
+                       //
+                       // Note that if you use query parameters as significant part of url
+                       // (the one that actually changes content on page)
+                       // you will have to configure url manually to keep query params, as
+                       // `window.location.origin + window.location.pathname` doesn't contain query params and
+                       // hash. For example default url for `https://example/com/example-post?id=1#hash`
+                       // would be `https://example/com/example-post`.
+                       //
+                       // The problem with query params is that they often contain useless params added by
+                       // various trackers (utm params) and doesn't have defined order, so Remark treats differently
+                       // all this examples:
+                       // https://example.com/?postid=1&date=2007-02-11
+                       // https://example.com/?date=2007-02-11&postid=1
+                       // https://example.com/?date=2007-02-11&postid=1&utm_source=google
+                       //
+                       // If you deal with query parameters make sure you pass only significant part of it
+                       // in well defined order
+      max_shown_comments: 10, // optional param; if it isn't defined default value (15) will be used
+      theme: 'dark', // optional param; if it isn't defined default value ('light') will be used
+    //   page_title: 'Moving to Remark42', // optional param; if it isn't defined `document.title` will be used
+      locale: 'zh', // set up locale and language, if it isn't defined default value ('en') will be used
+      show_email_subscription: true // optional param; by default it is `true` and you can see email subscription feature
+                                     // in interface when enable it from backend side
+                                     // if you set this param in `false` you will get notifications email notifications as admin
+                                     // but your users won't have interface for subscription
+    };
+  
+    (function(c) {
+      for(var i = 0; i < c.length; i++){
+        var d = document, s = d.createElement('script');
+        s.src = remark_config.host + '/web/' +c[i] +'.js';
+        s.defer = true;
+        (d.head || d.body).appendChild(s);
+      }
+    })(remark_config.components || ['embed']);
+</script>
+<script>
+    window.addEventListener('onColorSchemeChange', (e) => {
+        if (REMARK42) {
+            REMARK42.reset({
+                reload: true
+            });
+        }
+    })
+</script>