Adds apache, updates links.

Changes

• changes Burr -> Apache Burr
• removes DAGWorks Inc references.
• adds footer and incubator logo

How I tested this

• works locally

Notes

• this doesn't update the domain just yet -- need to figure out how to publish this on asf infrastructure.

Checklist

• PR has an informative and human-readable title (this will be pulled into the release notes)
• Changes are limited to a single goal (no scope creep)
• Code passed the pre-commit check & code is left cleaner/nicer than when first encountered.
• Anychange in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future TODOs are captured in comments
• Project documentation has been updated if adding/changing functionality.