Upgrade to Swiper 11

[kas-catholic]

We're using a very old version of Swiper.js. Moreover, our usage is partially broken - we'd like to have the "pagination" dots at the bottom (at least on small screens when all slides aren't visible), but they don't seem to be working. (Perhaps something is broken between our old version of Swiper and the react-id-swiper package we were using.

• Stop using react-id-swiper. Swiper 11 comes with native react support.
• Upgrade to Swiper React 11. Although the docs suggest Swiper React is deprecated and we should migrate to Swiper Element, I'm sticking with react for now because using Swiper Element with React and breakpoints involves more complication than I want to deal with. Let's keep it simple.

Fixes #45

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