[OSGeoLive] #2226: Update the Marble Quickstart

[OSGeoLive]

#2226: Update the Marble Quickstart
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 Reporter:  flicstar       |      Owner:  osgeolive@…
     Type:  defect         |     Status:  new
 Priority:  normal         |  Milestone:  OSGeoLive14.0
Component:  Documentation  |   Keywords:  Quickstart
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 The Marble Quickstart was reviewed by @flicstar as part of the Google
 Season of Docs in October 2019.

 It scored 2 out of possible 4. I added structure, headings and numbered
 steps.

 Please see comments in GitHub on this PR: ​https://github.com/OSGeo
 /OSGeoLive-doc/pull/560

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Ticket URL: <https://trac.osgeo.org/osgeolive/ticket/2226>
OSGeoLive <http://live.osgeo.org/>
self-contained bootable DVD, USB thumb drive or Virtual Machine based on Lubuntu, that allows you to try a wide variety of open source geospatial software without installing anything.