Update copy on site based on living copy document (#697)

* Update copy on site based on living copy document

* Updates copy from living doc v2

- updates shots

* Update styling to sidepanel

- make indicator heading white
- change bg color of add'nl indicators 'FAFAFA'

* Separate dataset cards sections by style

- abstract out additional cards color to utils
- create a baseCard mixin
- add datasetCardAdditional style block
- add additionalIndicator prop to DatasetCard
- lower abstaction of GridContainer from methodology to DatasetContainer
- updates snapshot

* Swap resolution and source in dataset cards

- update snapshots

* Update SVGs on About page

- re-center the SVGs to content vertically

client/src/styles/global.scss

@@ -430,6 +430,7 @@ p.secondary.j40-indicator {
     .j40-aboutcard-image {
       flex: 1 0 10%;
       align-self: flex-start;
+      @include u-margin-top(5);
     }
 
     .j40-aboutcard-link {