Replace headless-gl

[arose]

We are currently using headless-gl (https://github.com/stackgl/headless-gl) for rendering in node.js to do tests and create images. While headless-gl is wonderful, it has no WebGL2 support and there is no indication that it ever will. Three.js has now removed WebGL1 support (mrdoob/three.js#27836). For the next Mol* version I would like to do the same and clean-up/simplify the code base.

I asked in the WebGL community group (https://groups.google.com/g/webgl-dev-list/c/cZJ6-uwaprU) what is used as a replacement for headless-gl and the suggestion is to use Puppeteer. Using the full Browser stack with Puppeteer will also make support for WebGPU in the future easier.

[arose]

Hey @JonStargaryen and @midlik I would very much appreciate it if you could raise this issue in your teams and see if you can contribute a solution. Thank you 🙏!