track resources as a git submodule

[trusktr]

Along with

• commit package-lock.json #21

this helps to make the project fully reproducible at any commit. This is simpler and better than manually cloning the asset repo because it will always get the commit that is known to work, and doesn't require having to memorize where to clone.

As an example of why this is important, if you try the current main branch, and clone the res repo to examples/_res, some example will be broken, and the user will not know which commit to check out.

Closes #13

[trusktr]

Closes #13

[trusktr]

I'm still getting

http://localhost:3010/prototypes/_res/models/fortman/fortnite_mann.gltf 404 (Not Found)

in prototypes/armature/005_apose_tpose.html

Is the commit for res repo wrong? Or are you writing these example with private files on your local filesystem? If the latter, it would be so much better if you could push them to res so others like me can reproduce.

EDIT: I'm getting a lot of 404s in other pages too. Can you please push an update to res? Or, are those examples just not updated to the new system yet?