Add sellers main page merges to main

This adds a rough draft for the sellers main page, with option to select either an active or historic transaction. Selecting it routes to another page with elaborated information on the transaction. On this page, the seller can mark the transaction as delivered.

PS: the list on the home page will not auto-rerender if the seller marks the transaction as delivered, the transactions is currently only updated in the db. The user must refresh the app to see the change.