Exercises should not depend on search,
so they get their own module.

This is done as to reduce the file size
and complexity of the exercise-details component.

When scrolling through the search results,
load new results when the bottom of the page
is near.

This component contains the search input fields.

Exercise cards are useful in multiple places,
so they should be displayable by an independent
component.

The CSS for making the cards have the correct
width and height is very finicky and took a long
time to get to work. The current styling should
be refactored.

This is part of an effort to refactor
the large component "MockSearchComponent"
into smaller parts with well defined functionality.

The new component is used for the detail
view of a single exercise.