External demos

[greggman]

Some external demo links. Feel free to reject some or all of them if they are not appropriate

3 of them have WebGL fallbacks and it's not clear what if anything they demonstrate about WebGPU. One (the "aquarium") uses compute for various things. They could maybe be translated back to WebGL but no plans.

[kainino0x]

3 of them have WebGL fallbacks

Maybe you could add either a WebGPU-only mode (and link to that) or at least have an indicator when they fall back to WebGL?

Anyway I don't personally have a high bar for external samples, though I have been considering making separate sections for external "samples" and external "demos" with the latter providing less low-level WebGPU education.

[greggman]

• World Flights and Tokyo Trains both show in the top left: "WebGPU" or "WebGL"
• WebGPU-DOOM prints an error and provides a link to the WebGL2 version
• WebGPU Aquarium requires WebGPU

[greggman]

I removed the 3 with fallbacks. I think they aren't really a reflection of WebGPU.

[kainino0x]

I think it mainly depends whether they do something with WebGPU, or they're just using Three.js with fallback or whatever. Feel free to add in another PR, if you want!