Move view components to src/views

Follow-up of !1311 (merged)

Vue CLI and Vite introduce a standard way to structure Vue projects. Among the various directories are:

src/
  components/
    Something.vue
  views/
    Something.vue

The views directory is meant to hold components that are used directly in the router; actual pages of the frontend, not just parts of it.

We could move the components that are used in the router to the views directory to follow Vue's recommendations.