Add a component documentation

[slafayIGN]

Including:

• Props & Methods (update : maybe have a look at https://github.com/reactjs/react-docgen which seems used by Styleguidist and Storybook)
• Example
• All versions

[slafayIGN]

Example of Card Style here : https://geostyler.github.io/geostyler-docusaurus/docs/components/card-style/

With a second sidebar dedicated to the components (the first one being for tutorials)

[KaiVolland]

I'll try to update docusaurus to the latest version and then create more component documentation.

[slafayIGN]

@KaiVolland I tried a fresh docusaurus installation yesterday (3.8) but there wasn't much difference with the 3.4. And the PR from renovate worked well, so I just merged #13 just after your comment I didn't see.

[KaiVolland]

Nice. I switched to the Main repository anyways as upgrading the GeoStyler to 17 cuased Problems with webpack.