feat: add mobile menu for course chapters

[NitanJana]

closes #7

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[yaralahruthik]

@NitanJana we should also use the icons from Radix

https://www.radix-ui.com/icons

[NitanJana]

Sure, will do that. I started with shadcn but then thought of implementing without it.

[yaralahruthik]

Sure, will do that. I started with shadcn but then thought of implementing without it.

This also allows you to understand how Astro and React integrate.