Home Page Revamping

[rajarshimaitra]

• Update the activity list. Give details in the copy.
• Update the Roadmap infographics. Make it shorter and more concise.
• Remove Hands-on-lightning references from everywhere.
• Add calendar link in the footer.
• Add Bitcoin Design Community in collab list.

[rajarshimaitra]

More testimonials: https://docs.google.com/document/d/1JYpOACHEfIP1QZxZy4WEIMMCd5pgYcemt2B1ezMfn3M/edit?tab=t.0