PLT-6836 - Updating post spacing (#6745)

* PLT-6836 - Updating post spacing

* Updating post spacing

* Updating post margins

webapp/sass/layout/_markdown.scss

@@ -32,6 +32,10 @@ h6 {
     line-height: 1.5;
     margin: 10px 0;
 
+    &:first-child {
+        margin: 5px 0 10px;
+    }
+
     .emoticon {
         min-height: 1.5em;
         min-width: 1.5em;

webapp/sass/layout/_post.scss

@@ -1221,7 +1221,7 @@
         }
 
         p + p {
-            margin: 1.2em 0 0;
+            margin: 0.5em 0 0;
         }
 
         img {
@@ -1231,7 +1231,8 @@
         ul,
         ol {
             font-size: 13.5px;
-            margin-bottom: .4em;
+            margin-bottom: .11em;
+            margin-top: 3px;
             padding-left: 20px;
 
             p {
@@ -1283,12 +1284,12 @@
 
         ul + p,
         ol + p {
-            margin-top: 1em;
+            margin-top: .6em;
         }
 
         p + ul,
         p + ol {
-            margin-top: 1em;
+            margin-top: .6em;
         }
 
         .pending-post-actions {