css: unify comment and forum post css.

Unify comments and forum posts to have the same CSS and HTML structure.
Fixes various minor spacing and styling inconsistencies.

app/javascript/src/styles/specific/comments.scss

@@ -1,14 +1,22 @@
 @import "../base/000_vars.scss";
 
 div.comments-for-post {
+  div.hidden-comments-notice {
+    margin: 1em 0;
+  }
+
   div.list-of-comments {
     article.comment {
       display: flex;
-      margin-bottom: 2em;
+      margin-top: 2em;
       word-wrap: break-word;
       padding: 5px;
       flex: 1;
 
+      &:first-of-type {
+        margin-top: 1em;
+      }
+
       &[data-is-sticky="true"] {
         background: var(--comment-sticky-background-color);
       }
@@ -37,9 +45,8 @@ div.comments-for-post {
         flex-basis: 12em;
         margin-right: 1em;
 
-        h1 {
-          display: block;
-          font-size: $h3_size;
+        time {
+          font-style: italic;
         }
       }
 
@@ -66,10 +73,6 @@ div#c-comments {
       strong, time {
         margin-right: 0.3em;
       }
-
-      div.notices {
-        margin: 1em 0;
-      }
     }
 
     div.post-preview {

app/javascript/src/styles/specific/forum.scss

@@ -1,9 +1,13 @@
 div.list-of-forum-posts {
-  article {
+  article.forum-post {
     display: flex;
-    margin-top: 3em;
+    margin-top: 2em;
     word-wrap: break-word;
 
+    &:first-of-type {
+      margin-top: 1em;
+    }
+
     a.voted {
       font-weight: bold;
     }
@@ -25,7 +29,8 @@ div.list-of-forum-posts {
     }
 
     div.author {
-      flex-basis: 13em;
+      flex-basis: 12em;
+      margin-right: 1em;
 
       time {
         font-style: italic;
@@ -40,8 +45,6 @@ div.list-of-forum-posts {
       }
 
       menu {
-        margin-top: 0.5em;
-
         ul.votes {
           margin: 0.5em 0;
         }
@@ -88,13 +91,14 @@ div#c-forum-topics {
     padding: 0 0.5em;
   }
 
-  div.list-of-forum-posts article {
+  div.list-of-forum-posts article.forum-post {
     display: block;
     margin-top: 1em;
     border: var(--forum-post-border);
 
     div.author {
-      padding: 1em 1em 0;
+      margin: 0;
+      padding: 1em;
       border-bottom: var(--forum-post-border);
       background: var(--forum-post-author-background);
     }

app/javascript/src/styles/specific/posts.scss

@@ -320,10 +320,6 @@ div#c-posts {
       }
     }
 
-    div.notices {
-      margin: 1em 0;
-    }
-
     #image-container {
       margin: 1em 0 0.5em;
     }