Edit and Update: Enhancements to Cal-ITP Data Services Documentation

[shweta487]

This pull request addresses several updates and improvements to the Cal-ITP Data Services documentation as part of the broader effort to enhance the analyst curriculum. The following changes are included in this update:

• Removed references to outdated components in the documentation
• Updated URLs
• Updated content regarding Default vs Power User
• Added Metabase tutorial link
• Added Saving Code Common Issues
• Added Information regarding GCS Public Data Bucket
• Added Helpful Links
• Updated Caltrans Employee Resources
• Added Tidy Data information and reference

Pending:

• How to publish in Metabase
• Big Query in GCS
• External Tutorials
• Additional resources and Helpful Links.

[shweta487]

Issue