docs(get-started): add quickstart, improve title/meta, add concept page CTAs

[zawadzkidiana]

What changed?

Rewrote the `docs/get-started` index page: updated the page title and meta description for tutorial search intent, added a 5-minute SQLite quickstart above the fold, and replaced the prose "What's Next" section with a structured table linking to key Concepts and SDK guides.

Why?

The existing title ("Get Started") did not match how developers search for this content. The page had a low click-through rate pointing to a title/meta problem rather than a ranking problem. The quickstart removes the main friction point: visitors previously had to read through prose to find a first command to run. The structured What's Next table makes the onward journey explicit rather than relying on sidebar navigation.

How did you verify it?

`npm run build` — clean build.
`npm run start` — verified `/docs/get-started` renders the quickstart section and What's Next table correctly.
`npm run preview:github-pages -- --serve` — confirmed the page renders correctly in dark and light mode.

• Ran production preview (`npm run preview:github-pages -- --serve`)
• Checked dark mode and light mode on affected pages

Potential risks

The What's Next table links to `/docs/concepts/workflow-engine` and `/docs/concepts/open-source-workflow-engine`. These pages ship in PR #350 — merge that first or the links will 404 until it lands.

Related changes

Depends on PR #350 (`docs(concepts): add workflow engine and open source workflow engine pages`).

[gitar-bot]

CI failed: The CI build failed due to 14 broken links in the documentation, caused by incorrectly formatted root-relative paths and an expired or restricted Slack invite link.

Overview

The documentation link-checking suite (lychee) failed during validation. The errors are primarily caused by unresolved root-relative paths in the newly added 'get-started' documentation and one unreachable external URL.

Failures

Broken Documentation Links (confidence: high)

• Type: test
• Affected jobs: 78930946631
• Related to change: yes
• Root cause: The documentation uses root-relative paths (e.g., /docs/concepts/...) which the link checker cannot resolve because it lacks a configured base directory. Additionally, a 403 Forbidden error was triggered by an external Slack invitation link.
• Suggested fix: Convert all root-relative links in the changed files to relative paths (e.g., ../concepts/...). Verify the validity of the external Slack URL and replace it if the 403 error persists.

Summary

• Change-related failures: 1 (Documentation link validation failed).
• Infrastructure/flaky failures: 0
• Recommended action: Update the link syntax in docs/01-get-started/index.md to use standard relative paths and validate or remove the broken external link.

Code Review ✅ Approved

Rewrites the get-started index page with an added 5-minute quickstart and a structured navigation table for concepts. No issues found.

Rules ✅ All requirements met

Repository Rules

✅ Markdown Frontmatter Completeness: The updated docs/01-get-started/index.md contains a complete and correctly formatted frontmatter block.

✅ PR Description Quality Standards: The PR description provides a clear 'What', 'Why', and 'How' with concrete verification steps including production preview verification, meeting all PR template guidance.

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