Adapted Qwiklabs material to GitHub Repo

[dcanadillas]

I just moved the Qwiklab material to the workshop. I did the following:

• Moving old content to "legacy-workshop" folder
• Adding new structure and working with the materials from Qwiklab test
• Created two ways of doing it:
  • Google Cloud Shell format (One MD file from JenkinsXTutorial.md with load in shell button)
  • GitHub Markdown follow-up (divided in MD pages and sections)
• Modified Readme with all this new info
• New install script with possibility to use CJXD
• Updated PDF with presentation (New JX logos and stuff)

[kmadel]

@dcanadillas Still can't merge because of conflict with workshop.md