docs: add missing guides to CLI guides landing

[mvanhorn]

What/Why/How?

Closes #1519. The CLI guides landing pages (docs/@v2/guides/index.md and docs/@v1/guides/index.md) were missing cards for several guides that exist in the directory. This PR adds cards for them using the existing {% card %} pattern, with one-line previews sourced from the first paragraph of each guide.

v2 landing gains 8 cards:

• Configure API linting rules
• Set up tab completion
• Update Redocly CLI
• Migrate to Redocly CLI v2
• Migrate from openapi-cli
• Migrate from redoc-cli
• Migrate from Spectral
• Migrate from swagger-cli

v1 landing gains 7 cards (same list minus the v2 migration card, which doesn't apply to v1 docs).

Reference

• Issue: Update the CLI Guides landing page #1519 ("CLI docs have a landing page with guides on, but it's missing some of the migration guides and probably some other items. Update the page to include all guides and a little preview of what they are.")
• Files touched: docs/@v1/guides/index.md, docs/@v2/guides/index.md

Testing

This is a docs-only change. No code paths, build scripts, or rules files were modified. The cards use the same {% card title=... to="./..." %}...{% /card %} syntax as the existing cards on the same pages, so the docs renderer handles them the same way.

Preview rendering is not locally previewable per the issue note ("this can't be previewed locally, but open a draft pull request to see the preview") — this PR is suitable for inspecting the rendered preview via your docs build.

Screenshots (optional)

N/A — docs content only.

Check yourself

• This PR follows the contributing guide
• All new/updated code is covered by tests (docs-only; N/A)
• Core code changed? - N/A (docs only)
• New package installed? - N/A
• Documentation update has been considered (this IS a documentation update)

Security

• The security impact of the change has been considered (docs-only addition of existing internal links; no security surface)
• Code follows company security practices and guidelines

Closes #1519

This contribution was developed with AI assistance (Codex).

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Note

Low Risk
Low risk docs-only change that adds internal links on the guides index pages; main risk is broken/incorrect relative paths or titles.

Overview
Updates the CLI guides landing pages (docs/@v1/guides/index.md, docs/@v2/guides/index.md) to include additional guide cards that were previously missing.

The new cards link to existing guides for lint rule configuration, shell completion, CLI updates, and multiple migration guides (plus a dedicated v1→v2 migration card on the v2 landing page), each with a short one-line description.

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Latest commit: 1aa6847

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