Adds cli output to Try Habitat feature

[ryankeairns]

With things taking shape, I was able to run all of the commands (except -strategy and -bind) and get the actual output into the steps. This commit also adds some tab-style buttons to switch between terminal windows on a couple of steps and add a back link to view previous step.

[thesentinels]

By analyzing the blame information on this pull request, we identified @cwebberOps to be a potential reviewer

[ryankeairns]

@smith @juliandunn this is the PR for Try Hab content. Let me know what you think, thanks!

[cwebberOps]

@magwalk you may have thoughts... can you please take a look at the styling.

[juliandunn]

@ryankeairns you decided not to go with core/postgresql for the config injection? it's fine, just want to know if there was a reason for that.

Otherwise, 👍 and if @magwalk has no comments by tomorrow I'll r+ this

[ryankeairns]

@juliandunn I started with redis originally throughout (weeks ago), switched to postgresql when we were going down the road of setting up an app (as the example), then switched back to redis when we changed course to this new feature overview approach.

The other reason is that I was getting permission errors with postgresql, whereas redis worked reliably. I'm not as familiar with the added benefit of one over the other (as it pertains to our audience), but if you think it's worth the effort then I'll make the switch (~ 1 day worth of work).

[juliandunn]

@ryankeairns nah let's just go with this for now to get the "Try Habitat" experience out there. I can help you debug core/postgresql later if we want.

[juliandunn]

@thesentinels r+

[thesentinels]

📌 Commit 5d1503c has been approved by juliandunn

[thesentinels]

⌛ Testing commit 5d1503c with merge eb34db8...

[thesentinels]

☀️ Test successful - travis