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/components/SurveyButton/SurveyButton.tsx

@@ -6,6 +6,9 @@ import * as styles from './SurveyButton.module.scss';
 import * as CONTACT_COPY from '../../data/copy/contact';
 import J40MainGridContainer from '../J40MainGridContainer';
 
+// @ts-ignore
+import launchIcon from '/node_modules/uswds/dist/img/usa-icons-bg/launch--blue-70v.svg';
+
 export const onClickHandler = () => {
   Object.assign(document.createElement('a'), {target: '_blank', href: 'https://www.surveymonkey.com/r/cejst-survey'}).click();
 };
@@ -19,6 +22,11 @@ const SurveyButton = () => {
         className={styles.surveyButton}
         onClick={() => onClickHandler()}>
         {intl.formatMessage(CONTACT_COPY.PAGE_INTRO.SURVEY_TEXT)}
+        <img
+          className={styles.launchIcon}
+          src={launchIcon}
+          alt={'launch icon'}
+        />
       </Button>
     </J40MainGridContainer>
   );