Add license details to fix.md (#2938)

* Add license details to fix.md

Added license information to the ontology metadata, based on the comment by EBI's Adnan Malik made in a discussion of this topic: NFDI4Chem/Ontologies4Chem2026#16 (reply in thread)

* Add tracker URL to fix.md

Added tracker URL to the ontology fix documentation.

* Run `tox -e lint`

---------

Co-authored-by: Deepak <deepakunni3@users.noreply.github.com>

Author: StroemPhi

ontology/fix.md

@@ -8,8 +8,12 @@ contact:
 description: An ontology of physico-chemical methods and properties.
 domain: chemistry and biochemistry
 homepage: http://www.ebi.ac.uk/chebi
+license:
+  label: CC BY 4.0
+  url: http://creativecommons.org/licenses/by/4.0/
 products:
 - id: fix.owl
 - id: fix.obo
+tracker: https://github.com/cmungall/fix/issues
 activity_status: orphaned
 ---