Update seldon images doc to include missing and rearrange

[ukclivecox]

Fixes #1515

• Adds missing pre-packages servers and a few others
• Rearrange the sections into separate tables

[seldondev]

Mon Mar 23 09:28:38 UTC 2020
The logs for [lint] [2] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1578/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1578 --build=2

[seldondev]

Mon Mar 23 09:28:45 UTC 2020
The logs for [pr-build] [1] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1578/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1578 --build=1

[axsaucedo]

/approve

[seldondev]

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