Fix and improve release.yaml workflow

[benfrankel]

Relevant to #19.

Overview of changes:

• Trigger release on pushed tag starting with vA.B.C instead of any tag.
• Fix "prepare package" step of web release job (copy from the wasm-release folder instead of release).
• Set correct project and itch.io names.
• Add wasm-opt step for web release.
• Add name field to every step.
• Pull duplicate values into local env variables.
• Add helpful comments.
• Clean up formatting, names, wording, etc.

[BD103]

Looks good! I have a few notes, but nothing major. I think in the future this can be converted to a matrix due to the amount of duplicated code, but that's probably for a follow-up PR :)

[MiniaczQ]

Jan mentioned earlier that if we modify the base CI template we should submit the changes to the upstream, I think I agree with that

[benfrankel]

Jan mentioned earlier that if we modify the base CI template we should submit the changes to the upstream, I think I agree with that

Yeah that's probably true. Noting that their env variables and cargo build commands will be a bit different.

[MiniaczQ]

Looks good, best way to test it would be to run it 😉