Make vim help docs

[ckipp01]

Task

There is a lot of docs just stuffed in the readme. Much of it is duplicated in the Metals website. I'd like to focus on the screen shots and examples on the website, and for the extension move all the documentation to vim help docs.

[jsatk]

I'd be happy to take a pass at this @ckipp01. Let me know. 😄

[ckipp01]

So I'm actually not fully sure the best way to do this as it's not installed like a normal Vim plugin, so by default the docs won't be picked up. So it'd take a little bit of research to figure out how to get the docs available from :h. Altogether I'm a bit annoyed with having docs here and on the website, so I'm all open to suggestions about the cleanest way to just have everything in one place if possible and pointing to it from the other places. That's what I do with nvim-metals and it works pretty alright. Although I do get some people saying the docs are lacking because they only look on the website or the readme instead of in the help docs. What do you think?