Docs: Document BigQuery connector credentials and configuration

[esevastyanov]

Summary by CodeRabbit

• New Feature: Introduced a mandatory project_id configuration option for Rill projects to facilitate BigQuery connections and job executions. This allows users to specify the project ID for running BigQuery jobs.
• Documentation: Added comprehensive guides for configuring credentials in Rill for accessing BigQuery. This includes instructions for both local development and deployments on Rill Cloud, as well as a step-by-step guide for creating a service account with BigQuery access using the Google Cloud Console.
• Documentation: Updated the credentials documentation with a new link to the BigQuery guide for easy reference.

[coderabbitai]

Walkthrough

This change introduces documentation and configuration updates to support BigQuery connections in Rill. It provides instructions for setting up credentials, adds a new project_id configuration option, and updates relevant documentation links.

Changes

File Path	Summary
docs/docs/deploy/credentials/bigquery.md	Added documentation for configuring BigQuery credentials in Rill.
docs/docs/deploy/credentials/credentials.md	Updated with a new link to the BigQuery documentation.
docs/docs/reference/project-files/sources.md	Introduced a new project_id configuration option for BigQuery connections.

🐇

In the land of code, where the shadows lie,

BigQuery connections, now reach the sky.

With credentials set, and project ID,

Rill's power grows, as you can see! 🎉

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[coderabbitai]

Review Status

Actionable comments generated: 0

Configuration used: CodeRabbit UI

Commits

Files that changed from the base of the PR and between 4d675ea and 5df2bd3.

Files selected for processing (2)

• docs/docs/deploy/credentials/bigquery.md (1} hunks)
• docs/docs/deploy/credentials/credentials.md (1} hunks)

Files skipped from review due to trivial changes (2)

• docs/docs/deploy/credentials/bigquery.md
• docs/docs/deploy/credentials/credentials.md

[coderabbitai]

Review Status

Actionable comments generated: 0

Configuration used: CodeRabbit UI

Commits

Files that changed from the base of the PR and between 5df2bd3 and 8d9507a.

Files selected for processing (1)

• docs/docs/reference/project-files/sources.md (1} hunks)

Files skipped from review due to trivial changes (1)

• docs/docs/reference/project-files/sources.md

[begelundmuller]

Looks great, thanks!