Code comments improvements (#15722)

- Right-align the Reply and Resolve buttons
- Center Resolved text and add some padding
- Add padding to inline comments
- Indent the comment content to align with author name
- Re-parent form to allow better button layout space.

Co-authored-by: zeripath <art27@cantab.net>

web_src/less/_repository.less

@@ -1058,7 +1058,7 @@
 
       .code-comment {
         border: 1px solid transparent;
-        padding: .5rem 0;
+        padding: .25rem .5rem;
         margin: 0;
 
         .content {
@@ -1076,6 +1076,10 @@
           }
         }
 
+        .comment-content {
+          margin-left: 36px;
+        }
+
         .avatar.image {
           width: 28px;
           height: 28px;
@@ -1094,7 +1098,7 @@
         }
 
         button.comment-form-reply {
-          margin-left: 0;
+          margin: 0;
         }
       }