Update project references to Apache Burr and remove DAGWorks attributions

[harishkesavarao]

Update project references to Apache Burr and remove DAGWorks attributions

Changes

• Update GitHub URLs from dagworks-inc and DAGWorks-Inc to apache.
• Update documentation links from burr.dagworks.io to burr.apache.org.
• Update package references dagWorks-Inc/hamilton to apache/hamilton.
• Remove by DAGWorks Inc. attributions from documentation and examples.
• Standardize project URLs across READMEs, examples, and backend code.

How I tested this

Checked if all the URLs are valid after replacing DAGWorks with Apache Burr references

Notes

None

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.
• Any change 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.

[harishkesavarao]

Implements item 1 mentioned in #589 (comment)