[ADR-1] Use Monolithic Frontend

Context and Problem Statement

We consider two different ways of building our frontend: either a micro frontend, or a monolithic frontend.

Chosen option: "monolithic frontend", because

with the given resources (5 developers) and experiences, a monolithic frontend is easier to implement and thus allows us to focus on more important aspects

Good, because we do not need to consider requirements of a micro frontend with respect to the API gateway
Neutral, because there is a single repository for the frontend.
Good, because the frontend tech stack can be chosen rather freely. We decided to use Vue with Vuetify to create a single page web application.
Neutral, because all services have to support the API gateway for the frontend.
Bad, because results in whole stack not being "micro" end-to-end

Good, because would result in our whole stack to be "micro" from end-to-end
Good, because would frontends of services to be developed independently
Bad, because more difficult to implement, in particular with regard to given resources
Bad, because there are several frontend components, which are not clearly associated with a specific backend service