Updated URLs due to changes on the server side.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>

README.rst

@@ -85,7 +85,7 @@ Here is a small example:
     # start the job with the ID 123456 and override default configuration with the given one.
     >>> run_gms.py jobid 123456 --json_config /path/to/my/config.json
 
-There is a default configuration file, called `options_default.json <https://gitext.gfz-potsdam.de/geomultisens/gms_preprocessing/blob/master/gms_preprocessing/options/options_default.json>`_.
+There is a default configuration file, called `options_default.json <https://git.gfz-potsdam.de/geomultisens/gms_preprocessing/blob/master/gms_preprocessing/options/options_default.json>`_.
 This file contains the documentation for all the available configuration
 parameters.