feat: add multi level section menu

[h-enk]

https://deploy-preview-617--doks.netlify.app/

This PR also implements the option to auto generate the menu from the directory-folder (tree) structure (no manual configuration needed, respects set weight, respects setting mainSections) 🚀

New menu option setup in ./config/_default/params.toml:

[menu]
  [menu.section]
    auto = true
    collapsibleSidebar = true
    mainSections = ["docs", "tutorial"]

So, we get four multi level section menu options:

• Auto generated collapsibile section menu
• Auto generated default section menu
• Manual configured collapsibile section menu
• Manual configured default section menu

How to use /documentation will be available soon.

[james-d-elliott]

Looking really cool! Nice job! Only issue with it I can see is that.. I decided to start work on converting all my docs to doks, but now that this is coming I want to procrastinate! (just a joke obviously)

[h-enk]

You could cherry pick 😉

Only this file really changed: ./layouts/partials/sidebar/docs-menu.html

[james-d-elliott]

Yep, that's what I was planning on doing actually since we're forking and merging as necessary due to the significant changes we plan to do, I do really appreciate the information though, saves me figuring it out! I was mainly trying to express my excitement for this feature and my appreciation for your work.

[h-enk]

I was mainly trying to express my excitement for this feature and my appreciation for your work.

Thanks for that!

How to /documentation will be available soon