docs(credentials): replace environment variables page with credentials docs

[waleedlatif1]

Summary

• Removed the old environment variables docs page (all languages)
• Added new credentials section with docs for secrets, OAuth accounts, workspace vs personal scoping, access control
• Added screenshots for creating secrets, OAuth connections, using {{}} references, and the block credential selector

Type of Change

• Documentation update

Testing

Tested manually

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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Project	Deployment	Actions	Updated (UTC)
docs	Building	Preview, Comment	Feb 25, 2026 7:57am

[greptile-apps]

Greptile Summary

This PR replaces the outdated environment variables documentation with comprehensive credentials documentation. The new docs expand coverage to include both secrets (static API keys) and OAuth accounts (authenticated service connections), with detailed explanations of workspace vs personal scoping, access control, bulk import functionality, and best practices.

Key improvements:

• More accurate terminology: "credentials" better describes the feature than "environment variables"
• OAuth accounts documentation added (previously not covered)
• Access control and role-based permissions explained
• Visual documentation with 6 new screenshots showing the UI flow
• Clearer explanation of resolution order and scoping behavior
• Added bulk import documentation for .env-style content

Changes made:

• Removed old environment-variables.mdx files across all 6 language directories (de, en, es, fr, ja, zh)
• Added new apps/docs/content/docs/en/credentials/index.mdx with comprehensive documentation
• Updated meta.json to include credentials section in navigation
• Added 6 supporting screenshots to illustrate credential management workflows

The old environment variable images in /static/environment/ are now unused but not deleted in this PR.

Confidence Score: 5/5

• This PR is safe to merge - it's a documentation-only change with no code modifications
• Documentation update with proper content structure, valid image references, and clean removal of outdated files. No code changes, no broken links, and all screenshots properly added.
• No files require special attention

Important Files Changed

Filename	Overview
apps/docs/content/docs/en/credentials/index.mdx	New credentials documentation with comprehensive coverage of secrets, OAuth, scoping, and access control
apps/docs/content/docs/en/meta.json	Added credentials section to navigation
apps/docs/content/docs/en/variables/environment-variables.mdx	Removed old environment variables documentation (replaced by credentials docs)

_{Last reviewed commit: b7ab397}

[greptile-apps]

_{14 files reviewed, no comments}

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