Refactor naming for frontend

[powersaudrey25]

If this feature request related to a problem? Please describe.

As a team we decided to rename from customer and provider to clinic and technology provider for a more clear understanding of the roles in our application.

Alternatives Considered If Applicable

None

Rationale

This would cater our application to our specific client, medical imaging companies.

Implementation Ideas

Will need to rename instances of 'customer' and 'provider' on the web pages.

Additional Context

User story: #50

[powersaudrey25]

best to do this after #126 is closed