Update QuickStart contents

[jodygarnett]

Going to make a checklist so we can collect many small feedbacks :)

quickstart:

• assumes installation and/or docker available

  • "after going through installer steps" ... install instructions under "maintainer guide" is appropriate? No that page is empty...
  • "when you use docker" - but no docker instructions are anywhere to be found

  Indeed this quickstart page is the top pick when searching for docker instructions for geonetwork.

• Recommend: include install instructions here, no discussion of trade-offs like maintainer section, just step by step instructions installation

• installer quickstart page, step by step instructions from download to running start.bat

• tomcat quickstart page (replacing a war install instructions)

• docker quickstart page (recommend: Include docker instructions, or link to them)

Recommendation:

• Adopt a numbered step approach or template
• Break into individual pages?
• Adopt consistent RST syntax to avoid basic markup, and make use of directives (see Sphinx RST Style guide )

See:

• GeoNetwork Orientation which has point form notes of all the different installation options