[Toolkit] Delay/hide the "Community Kits" feature, minor fixes #3097
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I would like to improve the DX for community kit before releasing it, with a preview system based on custom glue and Storybook.
Thus, I prefer to hide/mark it in "WIP" the time the DX is improved, but nothing prevent developers to create their own custom kit if they want (through the dedicated command), it's just not correctly documented.

I also removed the
doc/index.rst
file, the website speak for itself, and the documentation about "create your kit" will be found in the fresh README.md when creating a kit. The documentation on symfony.com is useless IMO.