Separate installation and user guides into their own project

[practicalli-johnny]

There is a growing collection of tools and editors that can be used for Clojure development.

Creating a separate site can be used to document all possible combinations.

Then the ClojureBridge site can simply recommend specific tools from that site.

For example, most of the students at the latest ClojureBridge London event were using the Clojure CLI tools rather than Leiningen. We dont have any documentation around that and should we replace Leiningen with that. If we have both options documented in ClojureBridge workshop, it can be quite confusing as to which one students should install.

Note: project content should be updated to use Clojure CLI tools as it gives a much better experience.

[practicalli-johnny]

Use Practicalli Clojure install guide

Remove the install section from ClojureBridge London and link to the getting started section of Practicalli Clojure
http://practicalli.github.io/clojure/getting-started/