Add a glossary for acronyms

[bakaniko]

As suggested by flicstar [1], OSGeoLive is full of acronyms. In order to help non GIS people using OSGeoLive we can provide a glossary.

Sethg suggested the sphinx syntax: ​https://www.sphinx-doc.org/en/master/usage/restructuredtext/directives.html#glossary-directive

[1] ​​http://irclogs.geoapt.com/osgeolive/%23osgeolive.2019-09-17.log

[flicstar]

Updated title

[sethg]

Also to note once the glossary is in place any of the pages can automatically link to the relevant term using the following syntax:

:term:WMS

This will mean all acronyms and geospatial terms need only be explained in one place.

​https://sublime-and-sphinx-guide.readthedocs.io/en/latest/glossary.html

[kalxas]

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[kalxas]

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[kalxas]

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