CI for docs

[sriumcp]

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[sriumcp]

@kalantar This PR fixes your comments ...

Some observations:

• https://iter8-tools.github.io/docs/0.9/getting-started/concepts/#what-is-an-iter8-experiment
  What is the preferred case, Hub or hub. The section time is capitalized; elsewhere it is lower case. We should be consistent.
• https://iter8-tools.github.io/docs/0.9/getting-started/your-first-experiment/
  Install Iter8 binaries. "..with the [latest or any..." may be better expressed as "with latest or [any..."
  For Go install, is there a reason not to specify @{$TAG}? I guess I am struck by specification everywhere except here. I do see it on the Install Iter8 page.
• https://iter8-tools.github.io/docs/0.9/user-guide/commands/iter8_run/
  Shouldn't this include options --dry, --set.. and -f
• https://iter8-tools.github.io/docs/0.9/user-guide/commands/iter8_gen/
  Do we need this, isn't it the same as iter8 launch --dry?

Re: gen and run....

1. gen is now a hidden command. launch --dry essentially uses gen and stops at that stage. launch also invokes run. From an end-user point of view, there is no gen, only launch --dry.

2. run now runs experiment.yaml. So, --set and -f are no longer options for run. I think run is very useful for development purposes, which is the main reason for not hiding it. End-users get launch, which is what they will see in all the tutorials.

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Also, let us continue any further discussion through this PR (as usual) instead of the issue based discussion (which was temp).