Revert "Update data catalog (#718)"

This reverts commit 9f4d3f2.

data/catalogs/README.rst

@@ -80,24 +80,21 @@ structure per data set:
 - order the components of each data set alphabetically
 - for adding meta data use the following optional keys:
 
-meta:
-	category:
-	notes:
-	paper_doi:
-	paper_ref:
-	source_author: (if different from paper_ref)
-	source_license:
-	source_url:
-	source_spatial_extent:
-	source_temporal_extent:
-	processing_script:
-	processing_notes:
+category:
+notes:
+paper_doi:
+paper_ref:
+source_author: (if different from paper_ref)
+source_license:
+source_url:
+source_version:
+unit:
 
 updates
 -------
 
 - create new branch on github
 - make changes and bump the version in the global meta section using `calendar versioning <https://calver.org/>`
-- test your yml file (Can the added/changed data sources be read through HydroMT?), this can be done by running the test_data_catalog.py file located in this folder. Read the docstring for more information.
+- test your yml file (Can the added/changed data sources be read through HydroMT?)
 - create pull request
 - add new version to hydromt\data\predefined_catalogs.yml