docs: remove busted roadmap link

[mooreds]

This link doesn't work, so remove it and the section around it.

Summary by CodeRabbit

• Documentation
  • Removed the Roadmap section from the introduction documentation.

[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[coderabbitai]

📝 Walkthrough

Walkthrough

This change removes the "Roadmap" section from the introduction documentation, including its heading and the external link to Permify's public roadmap on Featurebase.

Changes

Cohort / File(s)	Summary
Documentation Update docs/permify-overview/intro.mdx	Removed the "Roadmap" section along with the external link to the Featurebase roadmap.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~1 minute

Possibly related PRs

• docs: update README.md #1518: Updates the Roadmap URL reference in README.md, related to roadmap documentation changes.
• docs: update the roadmap link in readme #1577: Replaces the roadmap external link in README.md, part of the same roadmap documentation consolidation effort.

Poem

🐰 A roadmap once stood here so grand,
But now it hops to distant land,
The intro breathes, cleaner and light,
No winding paths block the sight! 🌿

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The title accurately describes the main change: removing a broken roadmap link from documentation.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch mooreds/remove-roadmap-link

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.58%. Comparing base (d0324c2) to head (91c79e2).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2869   +/-   ##
=======================================
  Coverage   82.58%   82.58%           
=======================================
  Files          74       74           
  Lines        8297     8297           
=======================================
  Hits         6851     6851           
  Misses        910      910           
  Partials      536      536           

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[mooreds]

I have read the CLA Document and I hereby sign the CLA