Add Daily Challenge for Day 30

Daily Challenges/Day_30.md

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+### **Day 30: Revision and Preparation**
+
+Today is all about revising and consolidating your learning. Go through all the concepts we've covered so far and solidify your understanding. Tomorrow, we kick off the **Final Challenge**!
+
+- **Objective:**
+  - Revise everything you’ve learned, from HTML and CSS to JavaScript.
+  - Practice key concepts and revisit your previous projects to see where you can improve.
+
+- **What to do:**
+  - Go through your notes and code.
+  - Make sure you're comfortable with all the topics covered in this journey.
+
+- **What's Next?**
+  - Starting tomorrow, the final challenge begins! You’ll have until **2nd October, 6 PM IST** to build and submit your final project.
+  - Check out the [Project Submission Instructions](https://dev-wizards.github.io/front-end-frenzy/PROJECT_SUBMISSION.html) for more details on what to build and how to submit your project.
+
+Take your time to prepare today, and get ready to showcase your skills!
+
+**Happy revising, wizards!**