docs: Move docs to MkDocs

[Neko-vecter]

Description

This pull request is move current docs and some improvements to MkDocs.

What in this pull request?

• It can be deployed on GitHub Pages.
• Better document translation and localization (it easier translation and localization to other languages)
• Easier to navigate and search
• Better document structure (find things much easier)

Screenshots/Recordings/Graphs

Build the docs

It able build using docker by using command below

# clone from the fork 
git clone https://github.com/Neko-vecter/OrcaSlicer.git
cd ~/OrcaSlicer
docker run --rm -it -v ${PWD}:/docs squidfunk/mkdocs-material build

The build site in site folder.

Current progress

The action still in progress. (Testing now...)

Also the common issue I still being collected and organized.

-Neko.vecter

[igiannakas]

Amazing! Finally a nice way to visually represent the wiki!

[Neko-vecter]

@igiannakas Thanks! I am still working on the common issue.

As you mentioned earlier.
The publish_docs_to_wiki.yml is the action push doc folder to the GitHub repo wiki. The build for gh-pages I am still working on it also testing.

After finished new action workflows for the gh-pages I will open a new pull request to remove the old doc and add new workflows to the action.

-Neko.vecter