feat: inertia/vite/hooks experimental documentation

[Julien-R44]

This PR adds documentation related to recent additions to Inertia

• Add an experimental section on the sidebar
• Add a new Vite experimenta documentation
• Add a Inertia documentation
• Add an assembler hooks documentation
• Note about the inertia starter kit in the installation page

Inertia docs

I took the following approach: we are only covering the parts specific to Adonis.js. For the rest, people will have to consult the Inertia documentation directly

Preview : https://feat-inertia-doc.v6-docs.pages.dev/guides/inertia

Vite docs

So here, it's pretty much the same as the old documentation. Almost nothing changes, because the Vite changes are ultimately just implementation details, and I'm not sure it's worth covering them in the doc.

Preview : https://feat-inertia-doc.v6-docs.pages.dev/guides/experimental-vite

Assembler hooks

Preview https://feat-inertia-doc.v6-docs.pages.dev/guides/experimental-assembler-hooks

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• [x] Add Inertia starter kit in the Starters kit section

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[thetutlage]

All good 👍🏽