My first pass in updating use-case documentation

[silviamazzoni]

I have made significant updates to the seismic use cases. I have also updated the wind cases.

[silviamazzoni]

Are we now just waiting for @susanunit to approve?

[susanunit]

Apologies for the delay. Approved.

[silviamazzoni]

Thank you, Susan for the approval. Now someone needs to merge this...