Resolve "Create tablet admin page"

What does this MR do?

Add a page where the admin can select which tablet they are and then they are forwarded to the page where they can select the next slot.

Screenshots

before

after

Tablet select page

Slot page

Does this MR meet the acceptance criteria?

• I have added tests to validate the new functionality.
• I have updated the documentation accordingly. closes #87 (closed)