Added some documentation about the GMS infrastructure.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>
4 jobs for enhancement/improve_docs in 10 minutes and 50 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #50048
test_gms_preprocessing

00:10:13

63.0%
passed #50049
test_styles

00:00:21

 
  Deploy
passed #50050
pages

00:00:16

passed pages:deploy

00:00:02