feat: new doc stack

[agardnerIT]

This PR:

• Adds the required files to build the new doc stack / website
• closes New web stack POC #33

1. Check out this PR (or open this PR in a codespace)
2. Run pip install -r requirements.txt then mkdocs serve -a localhost:8000

Point your browser at http://localhost:8000

[agardnerIT]

I'm ignoring the failing YAML lint as this is failing on files that I haven't touched naturally during this work and so don't want to change those files

[Nexucis]

Hi @agardnerIT ! Thank you for starting this rework. 🙏

I just went quickly through the files pushed ( as I am on my phone at PromCon) and I have noticed you have pushed the Perses docs currently living in the upstream repo.

I would prefer these files be still in the upstream repo as much as possible.
The initial idea was that each repos will bring their own documentation and the website will aggregate the documentations of each repos.

For example, I believe it will make sense to have a documentation relative to the perses-operator and if the doc is NOT living in the perses-operator repo, that would be weird from my opinion.

Also having the doc living in the repo will allow us to version it like it the case today

[Nexucis]

closing this in favor of #35