[Improvement]: 🚀📒 Sync documentation with our docs repository

[ReneWerner87]

Currently in fiber we have a mechanism that synchronizes the documentation into the docs repository.
https://github.com/gofiber/fiber/blob/master/.github/workflows/sync-docs.yml ->
https://github.com/gofiber/fiber/tree/master/docs ->
https://github.com/gofiber/docs

The idea is to have a similar process that provides further versioned documentation for the other packages and extends the documentation page, besides the core documentation with the documentation about these packages.
https://github.com/gofiber/template ->
https://docusaurus.io/docs/next/docs-multi-instance#versioned-and-unversioned-doc

The current documentation will then no longer be in the core repository, but will be linked from it to another section
https://docs.gofiber.io/guide/templates

This will also make them more present and more enhancements, bugfixes or similar improvements can be expected