Why I am doing this, manifest update, minor changes

• Added “Why another free course” section to README.md
• Added project banner to README.md
• Added Stardance note in “Achievements” section to README.md
• Removed giscus comments from start page for visual clarity

This is the last post before the first ship. 🥳 I’m so excited! 😬 I’m so glad I got to share the current development process of this project so far in this (and previous) HackClub event(s).☺️

But this project is far from over. I’m looking forward to extending this even further with more content, different styling, functionality, translations etc.🫡