[Lit - Onboarding] Add copyright notices for project website footers to project website

[kj-powell]

[kj-powell]

Text for the copyright notices on website footers.

[kj-powell]

@justinfagnani can you please confirm that the above footers are on the Lit website?

[justinfagnani]

Hmm, looking more closely I only got the logo and added "Copyright (c) The Lit Project." and not the full copyright text: