Add github pages workflow?

[patrulhasirius]

Hi, while using the templete here I noticed that it's fairly trivial to make so the wasm build is deployed to the project's github pages.

Should I clean up my implementation and create a PR?

[alice-i-cecile]

Hmm! I can see the use for it, but most of the users of this end up using it for jam games hosted on itch. @mockersf or @rparrett may have stronger opinions.

[rparrett]

I'd personally love to have this as an option.

It was attempted in #41 but the PR stalled out (IMO) due to just being too large / trying to do too much other stuff.

[patrulhasirius]

I would probably make it an optional job just like the current itch job

[alice-i-cecile]

That sounds great :)