Add external link icons & all outstanding changes from Living copy (#1173)

* Refactor Footer component

- Make Footer component align to normal folder structure
- Make links in Footer use LinkTypeWrapper, which will allow icon to be added to all external links in one place

* Add Trussworks link to LinkTypeWrapper

* Add icon to SurveyButton comp

* Add launch icon to About page cards

* Add launch icon to FederalRegister link

* Refactor Methodology page

- Add Source and Available for fields to dataset Cards
- refactor data structure for dataset Cards to handle more than 1 source
- update constants file
- modify SASS for source list items
- update snapshots

* Add copy changes; How you can help and territories

* Update methodology section with copy changes

* Swap out all email links with <LinkTypeWrapper>

- update tests

client/src/data/copy/about.tsx

@@ -2,6 +2,8 @@ import React from 'react';
 import {defineMessages} from 'react-intl';
 import {FormattedMessage} from 'gatsby-plugin-intl';
 
+import LinkTypeWrapper from '../../components/LinkTypeWrapper';
+
 export const EXEC_ORDER_LINK = 'https://www.whitehouse.gov/briefing-room/presidential-actions/2021/01/27/executive-order-on-tackling-the-climate-crisis-at-home-and-abroad/';
 
 export const PAGE = defineMessages({
@@ -61,10 +63,12 @@ export const HEADING_1 = {
     tool identifies disadvantaged communities through publicly-available, nationally-consistent, and high-quality data.
     `}
     values={{
-      eoLink:
-      <a href={EXEC_ORDER_LINK} target={'blank'}>
-        Executive Order 14008
-      </a>,
+      eoLink: <LinkTypeWrapper
+        linkText={'Executive Order 14008'}
+        internal={false}
+        url={EXEC_ORDER_LINK}
+        openUrlNewTab={true}
+      />,
       tacklingItalics: <i>Tackling the Climate Crisis at Home and Abroad</i>,
     }}
   />,
@@ -80,10 +84,12 @@ export const HEADING_2 = {
     {eoLink} on {tacklingItalics}.
     `}
     values={{
-      eoLink:
-      <a href={EXEC_ORDER_LINK} target={'blank'}>
-        Executive Order 14008
-      </a>,
+      eoLink: <LinkTypeWrapper
+        linkText={'Executive Order 14008'}
+        internal={false}
+        url={EXEC_ORDER_LINK}
+        openUrlNewTab={true}
+      />,
       tacklingItalics: <i>Tackling the Climate Crisis at Home and Abroad</i>,
     }}
   />,