feat: contact us page

[Alessandro100]

closes #619
Summary:

Adds 'Contact Us' page to the mobility database

Expected behavior:

When you go on the contact us page, it should be responsive, and all the buttons and links should go / do their expected action

In the Header, 'contact us' should go to new contact us page

Testing tips:

Go on the 'Contact Us' page and click on all the links to make sure the are working correctly. Also make sure the navigation in the header works correctly

Please make sure these boxes are checked before submitting your pull request - thanks!

• Run the unit tests with ./scripts/api-tests.sh to make sure you didn't break anything
• Add or update any needed documentation to the repo
• Format the title like "feat: [new feature short description]". Title must follow the Conventional Commit Specification(https://www.conventionalcommits.org/en/v1.0.0/).
• Linked all relevant issues
• Include screenshot(s) showing how this pull request works and fixes the issue(s)

[github-actions]

Preview Firebase Hosting URL: https://mobility-feeds-dev--pr-791-cwy2hh3a.web.app

[davidgamez]

LGTM!