Make wagon installation clearer for developers

[cesarandreu]

There's a lot of text for beginners on the install wagon page, but really all experienced developers will care about is:

gem install locomotivecms_wagon

So maybe it should be bold. I'd say even mention it on top, replacing this:

Ruby veterans and experienced users may already have some or all of these dependencies installed, so feel free to skim.

With something like:

Ruby veterans and experienced users may already have some or all of these dependencies installed, so you might only need to run gem install locomotivecms_wagon

My initial thought was to run gem install wagon, but then I realized that was an entirely different thing, so then I had to look at your docs and the gem name didn't immediately stand out, which is annoying. 😞

[did]

hi @cesarandreu, that makes sense. I modified the page based on your comment. thanks!