Make collapsed comments more easily readable

Instead of lightening the text of collapsed comments and displaying them
in italics, this shrinks the font size a little but still keeps them at
the normal level of contrast. That should make them more easily readable
while still de-emphasizing them somewhat.

tildes/scss/_themes.scss

@@ -107,6 +107,10 @@
     border-color: $border-color;
   }
 
+  .comment-branch-counter {
+    color: $text-secondary-color;
+  }
+
   .comment-nav-link {
     color: $text-secondary-color;
   }
@@ -122,10 +126,9 @@
   %collapsed-theme {
     header {
       background-color: $background-color;
-      color: $text-secondary-color;
 
       .link-user {
-        color: $text-secondary-color;
+        color: $text-color;
       }
     }
   }

tildes/scss/modules/_comment.scss

@@ -45,7 +45,6 @@
 .comment-excerpt {
   display: none;
 
-  font-style: italic;
   margin-left: 0.4rem;
   white-space: nowrap;
   overflow: hidden;
@@ -146,6 +145,10 @@
   &.is-comment-by-op .comment-user-info {
     font-weight: normal;
   }
+
+  header {
+    font-size: 0.6rem;
+  }
 }
 
 .is-comment-collapsed:not(:target) {
@@ -157,6 +160,7 @@
 
   .comment-branch-counter {
     display: inline-block;
+    font-size: 0.7rem;
   }
 }