Update swup

[daun]

Description

• Update swup to v4
• Update plugins to match swup 4
• Remove custom code for scroll-target selector emulation
• Activate linkToSelf to allow hitting theme preview buttons multiple times in a row

Checks

• [x] The PR is submitted to the master branch
• [x] The code was linted before pushing (npm run lint)
• [x] All tests are passing (npm run test)

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[hirasso]

Beautiful! On mobile (iOS), switching to the overlay theme is a bit buggy (immediate blue screen without transition, animates out after a bit). Re-triggering the theme with linkToSelf works fine, though. Can you reproduce what I mean?

[hirasso]

The described bug isn't there on swup.js.org, so it should be fixeable

[daun]

@hirasso Yes! I've noticed it but ran out of time before looking further into it. Still wanted to create the PR, just to have it there. I'll look into this more in the coming days.

[hirasso]

Oops! Missed that you hadn't requested a review yet 🤦‍♂️😄

[daun]

Fixed the issue with the overlay theme preview. Ready to go :)