[Feat] Simplify js renderers workflow

[topheman]

Currently, when you work on js renderers for snakepipe render-browser in static/renderers, each time you make a change, you need to:

• rebuild: cargo build
• relaunch the server: snakepipe gamestate|snakepipe render-browser|snakepipe render

Web developers are used to a more immediate feedback loop.

Lets provide a better experience.