Summary: Chartio adds migration guide for Atlassian move

Why It Matters: The product is shutting down soon. Users are now being directed to specific tools and guides to move their data elsewhere before the deadline.

What Changed:

• Added a new link to a "Migration Guide" to help users move off the platform.
• Added a new website header with links to Documentation, Support, and the Blog.
• Added a footer with legal links and resource sections.
• Updated the page title to "Cloud-based data analytics exploration for all."