Fix margin above annotation-link and improve annotation-quote letter spacing and font-size. (#3308)

h/static/styles/annotation.scss

@@ -51,6 +51,9 @@ $annotation-card-left-padding: 10px;
 .annotation-link {
   @include font-small;
   color: $grey-4;
+  // Decrease the margin between the more/less link
+  // and the annotation body.
+  margin-top: -12px;
 }
 
 .annotation-replies:hover {
@@ -172,6 +175,8 @@ $annotation-card-left-padding: 10px;
   @include font-normal;
   color: $grey-4;
   font-family: sans-serif;
+  letter-spacing: 0.1px;
+  font-size: 12px;
 
   del {
     background:#ffe6e6;

h/static/styles/markdown.scss

@@ -56,6 +56,6 @@
   // Remove additional margin-bottom added by the last p within
   // the annotation-body
   p:last-child {
-    margin-bottom: 0;
+    margin-bottom: 1px;
   }
 }