docs + init: add install step

[marvinhagemeister]

Goal: Fully move to `nodeModulesDir: "manual"

• Add to docs
• We could run install directly similar to wizards from other frameworks

[fry69]

Do you envision something like a template system? Maybe something like cloning existing template repositories with a tiny/small number of string replacements? Or something different?

I brainstormed a few ideas a while ago (with the help of LLMs), see here -> https://gist.github.com/fry69/1e35c4bcf29d740975cc24bb211dfb3f

It is of course a bit convoluted, but there is an overview how other projects handle create/init scripts, including a comparison.

If you can direct where this should be heading, I'd love to flesh this out a bit more.

[marvinhagemeister]

Moving away from inline code like we do today might be worth it. It seems like folks expect there to be a folder in this repository with the init app laid out. This can happen independently of this issue here though.

[marvinhagemeister]

Looks like this is blocked on denoland/deno#30850 . When setting nodeModulesDir: "manual" the types for various babel packages cannot be found.

[marvinhagemeister]

Also blocked by denoland/deno#30929