Add general documentation

[bruno-f-cruz]

Closes #49
This PR adds general documentation to the Bonsai.Sgen tool.

It would greatly benefit from the latest docfx-tools, so for now I will simply write the articles and leave this as a draft.

[bruno-f-cruz]

@glopesdev @banchan86 Any chance we can get the new docs deployment rolling on this repository?

[banchan86]

@glopesdev @banchan86 Any chance we can get a new docs rolling on this repository?
I can handle this next on my to-do list!

[banchan86]

Hey @bruno-f-cruz I setup the docfx website, I built on top of your changes because you had already setup some stuff, but I don't have permission to push changes to your fork. Do you want to add me to it? For now I just set it up on https://github.com/banchan86/sgen-docs/tree/docs-add-general-docs. Couple of issues:

1. There is an empty bonsai file, person-and-pet-enum.bonsai, thus no image is being generated for that file.
2. I moved the source code into its own src folder in keeping with how we have recently organized our repos, but that might break the GitHub Actions workflow dotnet.yml. Not sure how to change it though.
3. Local docfx preview works if you just want to see the website while revising the docs, but I have not added a GitHub Actions recipe for online docs generation, as it seems we are revising it Use artifacts output layout and modern CI props zeromq#23. It makes quite a few changes, and I am not confident in reproducing it yet (I am also not sure its set in stone).
4. Also found this little bug while generating the local preview, not sure why I didn't catch it before haha Workflow container padding lost for workflows >3 levels high docfx-tools#19.

[bruno-f-cruz]

Thanks for setting it up. I should have clarified a bit more what I meant, sorry! Do not worry about the content of my PR for now. All we need is to add the docs structure to the main branch via a separate PR and I will rebase on my end!
Once again thanks :)

[banchan86]

Thanks for setting it up. I should have clarified a bit more what I meant, sorry! Do not worry about the content of my PR for now. All we need is to add the docs structure to the main branch via a separate PR and I will rebase on my end! Once again thanks :)

ah i see ok im raising a separate PR!