New documentation site

[ikitommi]

new separate site with new docs for 2.0.0, to replace the current wiki.

• meta(was: Documentation Suggestion #312)
• deployment (was: Wiki page about deployment #188)
• nil body handling (was: Untraceable error with Swagger UI for GET method that requires a body. #251)
• no-AOT-docs (was: no-AOT docs & samples #155)

[miikka]

I'm thinking of moving the 2.0 guides + some other content from the wiki to cljdoc articles and calling this done. The 1.x content and some of the more obscure stuff can be kept on the wiki.

[ikitommi]

Awesome++