GitHub token validator glassmorphism

[aditisb1212-lab]

What does this PR do?

Adds a new Glassmorphism-themed GitHub Token Validator tool that allows users to validate GitHub Personal Access Tokens directly in the browser.

Features

• Validate GitHub Personal Access Tokens
• Display token owner information
• Display GitHub username
• Display token status
• Display token scopes (when available)
• Display token expiration date (when available)
• Show/Hide token functionality
• Responsive Glassmorphism UI
• Fully client-side implementation (no backend)

Closes #<9>

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Type of Change

• New tool
• Enhancement to existing tool
• Bug fix
• Documentation update
• Build system / infrastructure

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Screenshot

Added github-token-validator-glassmorphism.png in the tools/ directory.

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Checklist

• I have read the Contributing Guide
• My branch follows the naming convention (add/github-token-validator-glassmorphism)
• I have tested my changes locally in at least one modern browser

For new tools:

• The tool is a single self-contained .html file in the tools/ folder
• The filename is kebab-case (github-token-validator-glassmorphism.html)
• I added an entry to data/tools.json with all required fields
• I added a screenshot as tools/github-token-validator-glassmorphism.png
• No JavaScript frameworks or heavy UI libraries were used
• CDN links were not required
• I ran node scripts/sort-norm.js data/tools.json
• I ran node scripts/build.js and verified the landing page renders correctly

For enhancements / bug fixes:

• I have not introduced any external dependencies
• The tool still works as a standalone single HTML file