Update Azure Blob Storage instructions.

[bryanpaget]

I've updated the Azure Blob Storage document to include instructions for migrating MinIO files to Blob storage.

Closes #1819

[bryanpaget]

How to Migrate from MinIO to Azure Blob Storage

First, import the environmental variables stored in your secrets vault. You will either import from minio-gateway or fdi-gateway depending on where your data was ingested.

jovyan@rstudio-0:~$ source /vault/secrets/fdi-gateway-protected-b

Then you create an alias to access your data.

jovyan@rstudio-0:~$ mc alias set minio $MINIO_URL $MINIO_ACCESS_KEY $MINIO_SECRET_KEY

List the contents of your data folder with mc ls.

jovyan@rstudio-0:~$ mc ls minio

Finally, copy your MinIO data into your Azure Blob Storage directory with mc cp --recursive.

jovyan@rstudio-0:~$ mc cp --recursive minio ~/buckets

[bryanpaget]

Needs to be tested.

[chuckbelisle]

Great work, thank you for updating the documentation in both languages. The only thing I can see that could use some polishing is the mc cp --recursive minio ~/buckets command should note that the user should copy the data to the correct sub bucket (unclassified, Protect B, etc)