Patch terms of data access (#108)

* Update link for terms of data access

Use GitHub, not readthedocs as the canonical link

README.md

@@ -56,7 +56,7 @@ uvicorn offsets_db_api.main:app --reload
 All the code in this repository is [MIT](https://choosealicense.com/licenses/mit/) licensed.
 
 > [!IMPORTANT]
-> Data associated with this repository are subject to additional [terms of data access](https://offsets-db-data.readthedocs.io/en/latest/TERMS-OF-DATA-ACCESS.html).
+> Data associated with this repository are subject to additional [terms of data access](https://github.com/carbonplan/offsets-db-data/blob/main/TERMS_OF_DATA_ACCESS).
 
 ## about us