feat(tutorial): add organized tutorial contents section with links

[alicanerdurmaz]

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Bugs / Features

• Related issue(s) linked
• Tests for the changes have been added
• Docs have been added / updated
• Changesets have been added https://refine.dev/docs/guides-concepts/contributing/#creating-a-changeset

What is the current behavior?

40 tutorial pages are flagged as orphan pages by crawlers because the TutorialNavigation component renders links inside a closed dropdown with max-height: 0 and opacity: 0. Search engines cannot discover these hidden, JavaScript-dependent links.

What is the new behavior?

Added a "Tutorial Contents" section to tutorial/essentials/intro/index.md with static HTML links to all 40 tutorial pages, organized by topic. These links are SSR-rendered, always visible, and crawlable, resolving the orphan page issue.

fixes (issue)

Notes for reviewers

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