Update section to match the latest CLI version, and ensure smoothest possible hour-1 learning experience.

Motivation
With our booth at the React London conference, our main "call to action" for visitors will be to get devs to "try it in 1 hour" by visiting the new frontend section with this handy link http://magnolia-cms.com/start-ld

Details

On On https://documentation.magnolia-cms.com/display/DOCS/Install+Magnolia

Change message to make sure user experience matches the CLI
Change: If you already installed Magnolia CLI and want to update to the latest stable version, use:
To: If you already installed Magnolia CLI, update to the latest version: DONE

Update help output
mgnl help has different output now.DONE

Update the jumpstart output to:
info Magnolia has been successfully setup for light development!
info You can now open a new terminal tab or window and start it up with the CLI command 'mgnl start'
info Magnolia will be ready after a few seconds at localhost:8080/magnoliaAuthor. Username and password is superuser DONE

Simplify Start
Start Magnolia section can be very reduced because of introduction of mgnl start command.

• Remove tip bullet: "Remember the path to the bin directory....."
• Remove all the details under "Start Magnolia", because not necessary anymore.
• Add "Execute the Magnolia CLI start command:" mgnl start
• Add "On the first start, Magnolia will run the "web update" and automatically install all modules."
  DONE

Update "Install Magnolia" section
Just remove the whole section - they can go straight to the Login step.
DONE

Remove or simplify tip about "light modules" directory.
Suggestion "The jumpstart command automatically creates a light-modules directory for you. If you already have a different directory that you want to use for light modules, edit the magnolia.resources.dir property in your magnolia.properties file to point to it."
DONE

On: https://documentation.magnolia-cms.com/display/DOCS/Hello+Magnolia+for+front-end+developers

Conclusion
There should be a bit more of a concrete end. They have finished the intro section and the tutorial, and now understand the basics and could create their own componnts. Right before the "Go further" section.
Suggestion:
Congratulations
You have finished the "Get Started" section for front end developers, and have learned the key Magnolia concepts.
DONE

Go Further
Add two bullet point to the top:
Hello Magnolia - A step by step walkthrough of creating the Hello Magnolia light module.
CLI Overview - Watch the CLI Video to learn how to quickly create modules, and page and component templates
DONE