removed top margins on headings

vue-theme/src/sss/_typography.sss

     margin-right: 0
 h1
     font-size: 2em
-    margin-top: 0.6em
+    /* margin-top: 0.6em */
     margin-bottom: 0.6em
 h2
     font-size: 1.5em
-    margin-top: 0.8em
+    /* margin-top: 0.8em */
     margin-bottom: 0.8em
 h3
     font-size: 1.17em
-    margin-top: 1em
+    /* margin-top: 1em */
     margin-bottom: 1em
 h4
     font-size: 1em
-    margin-top: 1.33em
+    /* margin-top: 1.33em */
     margin-bottom: 1.33em
 h5
     font-size: .8em
-    margin-top: 1.6em
+    /* margin-top: 1.6em */
     margin-bottom: 1.6em
 h6
     font-size: .67em
-    margin-top: 2em
+    /* margin-top: 2em */
     margin-bottom: 2em