docs: update project URLs (#12)

Author: alhendrickson

docs/index.md

@@ -28,15 +28,15 @@ overview/_index
 :hidden:
 :caption: CogStack NLP
 MedCAT <https://docs.cogstack.org/projects/nlp>
-MedCAT Trainer <hhttps://medcattrainer.readthedocs.io//>
+MedCAT Trainer <https://docs.cogstack.org/projects/medcat-trainer/>
 
 ```
 
 ```{toctree}
 :hidden:
 :caption: CogStack Platform
 
-NiFi <https://cogstack-nifi.readthedocs.io/en/latest/>
+NiFi <https://docs.cogstack.org/projects/nifi/>
 
 platform/_index
 ```