Feature/cdpt 636 intranet headings typescale improvements (#791)

* CDPT-636: Update heading styles in the rich text component
- Add new rems font sizes in the rich text component and for page headings
- Clarify the 62.5% decision in reset.styl

* CDPT-636: Update heading styles in the rich text component
- Stop totalpoll overrides applying everywhere

* CDPT-636: Update heading styles in the rich text component
- Order

public/app/themes/clarity/src/components/c-polls/style.styl

@@ -7,6 +7,12 @@
 
 // Overriding Totalpoll plugin styles to Clarity theme styles.
 // Needs to be outside of this specific component's scope so it is global and will affect wherever the shortcode is used on the site.
+.totalpoll-wrapper {
+  h4 {
+    font-size: $mantle !important;
+  }
+}
+
 .totalpoll-button, .totalpoll-button-primary, .totalpoll-button-vote {
   cursor: pointer !important;
   font-size: $outerCore !important;
@@ -53,10 +59,6 @@
   display: none !important;
 }
 
-h4 {
-  font-size: $mantle !important;
-}
-
 .totalpoll-question-choices-item-votes-text {
   font-size: $outerCore !important;
 }