* Disable sort buttons when there is a search query
* Restore sorting order when search query is removed
* Update comment
* Add button to sort by relevance (non-functional)
As discussed in #949. Relatedly also removed the functionality that
disabled the "sort by color" and "sort alphabetically" buttons (and
related styling).
* Update sorting behaviour
Refactored to sorting algorithms into a single function and updated
relevant code. The "sort by relenvance" button is now functional, and is
automatically actived when the user starts searching, but not when
updating their search query.
* Restore sorting ordre when search query is removed
* Only sort when needed
* Refactor activing a sorting button/selecting a soring order
* Renaming variables and functions
* Add colors to "order by relevance" button on hover
Put all of the CSS and most of the JavaScript into their own file. The
JavaScript that is left in HTML depends on some Liquid logic present in
the HTML.
