CU-8695q21f6: Replace rosalind links with S3 ones in docs (#489)

docs/main.md

@@ -122,12 +122,12 @@ If you have access to UMLS or SNOMED-CT, you can download the pre-built CDB and
 A basic trained model is made public. It contains ~ 35K concepts available in `MedMentions`. This was compiled from MedMentions and does not have any data from [NLM](https://www.nlm.nih.gov/research/umls/) as that data is not publicaly available.
 
 Model packs:
-- MedMentions with Status (Is Concept Affirmed or Negated/Hypothetical) [Download](https://medcat.rosalind.kcl.ac.uk/media/medmen_wstatus_2021_oct.zip)
+- MedMentions with Status (Is Concept Affirmed or Negated/Hypothetical) [Download](https://cogstack-medcat-example-models.s3.eu-west-2.amazonaws.com/medcat-example-models/medmen_wstatus_2021_oct.zip)
 
 Separate models:
-- Vocabulary [Download](https://medcat.rosalind.kcl.ac.uk/media/vocab.dat) - Built from MedMentions
-- CDB [Download](https://medcat.rosalind.kcl.ac.uk/media/cdb-medmen-v1_2.dat) - Built from MedMentions
-- MetaCAT Status [Download](https://medcat.rosalind.kcl.ac.uk/media/mc_status.zip) - Built from a sample from MIMIC-III, detects is an annotation Affirmed (Positve) or Other (Negated or Hypothetical)
+- Vocabulary [Download](https://cogstack-medcat-example-models.s3.eu-west-2.amazonaws.com/medcat-example-models/vocab.dat) - Built from MedMentions
+- CDB [Download](https://cogstack-medcat-example-models.s3.eu-west-2.amazonaws.com/medcat-example-models/cdb-medmen-v1.dat) - Built from MedMentions
+- MetaCAT Status [Download](https://cogstack-medcat-example-models.s3.eu-west-2.amazonaws.com/medcat-example-models/mc_status.zip) - Built from a sample from MIMIC-III, detects is an annotation Affirmed (Positve) or Other (Negated or Hypothetical)
 
 ## Acknowledgements
 Entity extraction was trained on [MedMentions](https://github.com/chanzuckerberg/MedMentions) In total it has ~ 35K entites from UMLS