Implementation of the documentation framework

[12rambau]

WIP

TODO

• Use the smallest possible configuration
• move the examples into the documetnation tree
• use the pydata sphinx theme
• use a nox session to build the documentation
• move code of conduct in the root folder

Fix #137

[12rambau]

@jdbcode can you allow the build of the documentation upon pull requests ? I work from my company computer in a GitHub codespace so I cannot look at the builds, I can just check if they work. Having the prebuild would allow me to check the rendering.

[jdbcode]

@12rambau The webhooks are already set to trigger on "Pull request"

Is it not working as intended? If not, I wonder if the draft status is to blame?

[12rambau]

I think it's unrelated I usually do drafts in all my repositories and it triggers the build of the documentation anyway.
I checked in this PR: #179 which have all the workflow approved and the RDT one didn't start. normally it should be part of the list as in gee-community/geetools#289 where RDT is the last build item.

[jdbcode]

Doing a cleanup. This PR is mostly addressed in the refactor #275. Closing.