Add "River" Option in Map Component

[Suresh-Chelani]

What would you like to be added?

Add a "River" toggle button in the IndiaMap.astro component located at the route /map/dance. When enabled, it should:

• Show SVG paths for major rivers of India on the map.
• Display river names as labels next to their respective paths.
• Allow toggling this feature on and off interactively.

Why is this needed?

• Enhances the educational value of the map.
• Improves interactivity and user engagement with geographical data.