Include current CLI version in generated docs page

[amisevsk]

Description

Add version to CLI reference page, now (slightly) less ugly:

Linked issues

Closes #146

[amisevsk]

Just realized that this will look strange with our current version format 0.2.0-93739be

[javisperez]

Just realized that this will look strange with our current version format 0.2.0-93739be

As it lives in the package.json maybe we can just show it in the sidebar, in a smaller, less "eye catching" way? just throwing ideas...

[gorkem]

I agree, I was not expecting it on the header. Somewhere on the sidebar makes sense.

[amisevsk]

We can put it wherever we like, I just don't see a good spot in the sidebar (unless we want to do a dropdown + previous versions, but that seems like a v1.0 problem).

[bmicklea]

We're doing this so we can check for consistency, not because we're doing a fancy drop-dow-to-view-old-versions thing. So my vote would be:

• Small text below the title, normal font
• Small text at the bottom of the page, normal font