docs(v7): use github source link instead of broken v7 doc site

[ckdwns9121]

Description

The link to the v7 documentation website (react-table-v7.tanstack.com) in the README is broken/redirecting incorrect page.

Since the v7 website seems unsupported, this PR updates the link to point directly to the v7 documentation source files hosted on GitHub, ensuring users can still access the guides.

🎯 Changes

• Updated documentation link in README.md to point to docs/src/pages/docs/overview.md on the v7 branch.

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm test:pr.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

[changeset-bot]

⚠️ No Changeset found

Latest commit: b2eed0b

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

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