feat: Add Timezone Converter tool (#24)

[SriAish05]

🛠️ Timezone Converter Tool

Implemented timezone converter as requested in issue #24

Changes:

• ✅ Created timezone_convertor/ directory with 3 files (index.html, style.css, script.js)
• ✅ IST ↔ UTC conversion and 12+ other timezones
• ✅ Epoch timestamp display with copy button
• ✅ Added to "Information & Reference" section in home.html after IP Address tool
• ✅ Mobile responsive design
• ✅ Matches DevDunia's glass morphism color scheme

Testing:

• Tool works as expected
• Mobile responsive
• Linked in homepage
• Color scheme matches existing tools

Closes #24

[echobash]

@SriAish05 Everything looks so good. Good work in the PR.
I have one small suggestion. Can you add the file in the sidebar too similar to how you added in home.html.
Once that's done, we'll merge it.

[SriAish05]

@echobash Thank you so much for the review and for pointing that out! I actually noticed the sidebar was missing as well and was working on fixing it.

I'll add the Timezone Converter to the sidebar navigation nd push the changes within the next hour.

I apologize for missing this initially. I really appreciate your patience and feedback! 🙏

Will update shortly(1 Hour maximum). Thanks again! 🚀

[echobash]

@SriAish05 Changes look good now as per the codebase standard. Merging this PR now..
Feel free to give a star to the Repo and use the tool para your daily development.