[Good First Issue]: Display 'License' filter dropdown in the web directory header #30

Task Summary

Add an optional dropdown filter in the filter bar to filter tools specifically by license (e.g. MIT, Apache-2.0, GPL-3.0, BSD-3-Clause).

Difficulty Level

🟡 Intermediate (JavaScript/TypeScript, CSS/Tailwind, or Node.js scripts)

Context & Background

Enterprise engineers and commercial developers often need to filter tools strictly by permissive licenses (MIT / Apache-2.0). Adding a license filter pill or select dropdown makes DevShelf corporate-friendly.

Suggested Steps to Complete

1. Review site/app.js and site/index.html.
2. Extract all unique licenses from allResources dynamically during boot().
3. Add a license filter tag group or dropdown select.
4. Filter matching resources in the render() function.

Relevant Files / Pointers

site/app.js, site/index.html

Mentorship & Support

• Maintainers will review this PR within 24-48 hours and provide constructive feedback.
• Upon merge, the contributor will receive a shoutout on social channels and be featured in README!