[Search page] : Pagination

[cmoinier]

Description

This PR adds a pagination component to the search page.

To test

With the local dump, you will need to decrease the pageSize in SearchResultsComponent to 2-3 in order to see the pagination work properly. It is set to 18 because the ticket asked for a display of 3x6 cards.

[Angi-Kinas]

Thank you @cmoinier for implementing the pagination, it looks really cool! :)
I just see a small improvement in the the font-weight of the "previous" and "next" button and their respective icons.
The rest would be a nice to have :-)

[Angi-Kinas]

@cmoinier thank you for the adaptions!
Looking at the mockups, I just realised one more thing. When being on page 1, there is no "previous" button and I guess for the "next" button it is the same logic, when you are on the last page.
I'm not sure if it is really important, since the buttons are disabled, but it would be closer to the mockup. I realized this, when having only one page:

Also something I discovered (by mistake). If you only have one page, but in the url you use _page=2, it goes to the next empty page. Is that what we expect?

[Angi-Kinas]

Thank you for implementing my suggestions @cmoinier
LGTM 👍