[WIP] Embed a REPL in symbol pages

[DjebbZ]

High-level discussion in #26

[DjebbZ]

For the next steps, I'd like to use KLIPSE the following way :

• Make the Examples runnables
• Since examples can contain arbitrary markdown (good thing), I need to distinguish between code blocks and text to make each code block runnable with KLIPSE. Fortunately marked gives access to the parser.
• This way, no need to change the "spec" of cljs-api.edn, and the examples would reusable as they are.

What do you think ?

[shaunlebron]

@DjebbZ sorry for late reply, this sounds good so far! thanks for doing this 👍