[Landing Page] Footer

[shachar-langer]

Add a responsive footer to the landing page.

• The footer should have similar behavior to the footer on morehumaninternet.org.
• The GitHub icon should link to the extension repo.
• The Donate button should link to our buymeacoffee account.

[shachar-langer]

Update

New design:

• The MHI logo should be clickable. URL - https://morehumaninternet.org/
• GitHub URL - https://github.com/morehumaninternet/roar-extension
• Twitter URL - https://twitter.com/morehumaninter1
• LinkedIn URL - https://www.linkedin.com/company/more-human-internet/
• Buy me a coffee URL - https://www.buymeacoffee.com/morehumaninter
• Email Link - mailto:info@morehumaninternet.org