Implement downloads page and May 25th timed copy changes (#1653)

* Add initial side nav

* Add Download page as a sub-page under Meth&Data

- udpate S3 file path in .envs
- remove the DownloadPacket component
- move download copy from methodology to download
- modify header to use two types of navs:
--  mobile (with sub-pages) and
-- desktop (without subpages)
- create a SubPageNav component
- add SubPagNav to Meth and Download page
- update snapshots
- add global CSS overide to remove minus sign on mobile nav link accordion as it's permanently open

* Remove the update tag above Public eng button

* Make the 3rd bullet on explore page update on 5/25

* Make the RFI box text change after 5/25/22

* Update site with RFI expired copy, remove Alerts

- add Spanish translations
- update snapshots

* Fix typo on XLS file path

* Refactor HowYouCanHelp to standard form

* Add custom download links with icons

- add new DownloadLink compnent
- add Spanish translations

* Update download file sizes

* Allow meth&data nav link to collapse on mobile

client/src/components/PublicEngageButton/PublicEngageButton.tsx

@@ -1,6 +1,9 @@
 import React from 'react';
 import {useIntl, Link} from 'gatsby-plugin-intl';
-import {Button, Tag} from '@trussworks/react-uswds';
+import {
+  Button,
+  // Tag
+} from '@trussworks/react-uswds';
 
 import * as styles from './PublicEngageButton.module.scss';
 import * as PUBLIC_ENG_COPY from '../../data/copy/publicEngage';
@@ -13,11 +16,12 @@ const PublicEngageButton = () => {
 
   return (
     <div className={styles.container}>
-      <div className={styles.tagContainer}>
+      {/* Remove Updated Tag for now */}
+      {/* <div className={styles.tagContainer}>
         <Tag className={styles.tag}>
           {intl.formatMessage(PUBLIC_ENG_COPY.PUBLIC_ENG_BUTTON.TAG_LABEL)}
         </Tag>
-      </div>
+      </div> */}
       <Link className={styles.link} to={'/public-engagement'}>
         <Button
           type="button"