Add category header and updates from Living Copy (#1084)

* Add category header (Indicator and Percentile)

- add local styling
- override accordion-content styles to push into parent container
- intl copy
- update snapshots

* Add latest Living Copy

- refactor dataset cards to allow for any styling in description, used in and responsible party
- add percent for HS edu indicator
- updates snapshots

* Update copy from Living Copy doc

-update snapshots

* Add methodology to copy

* Remove link from readme file based on md checker

* Comment out certain markdown links from checker

* Comment out markdown links that render in browser

client/src/components/AreaDetail/areaDetail.module.scss

@@ -82,3 +82,21 @@ $sidePanelLabelFontColor: #171716;
     font-size: medium;
   }  
 }
+
+// The following class is used in the AccordionItems in the AreaDetail component.
+// The Accordion component (parent of AccordionItems) requires some CSS overrides.
+// Local styling is not allowing the override. 
+// The override is needed to push into the bounds of the Accordion component's styles.
+// To override this, in globals.scss, we set the this .categoryHeader's vertical alignment by
+// setting styles in:
+//    .usa-accordion__content > *:first-child
+// This first child of the accordion content is the category header:
+.categoryHeader {
+  display: flex;
+  justify-content: space-between;
+  text-transform: uppercase;
+  font-size: small;
+  @include u-bg('gray-cool-5');
+  @include u-padding-left(2.5);
+  @include u-padding-right(2);
+}