fix: improve web vitals

[Dozie2001]

This PR aims to improve the following web vitals:

• LCP tackling Fix Largest Contentful Paint (LCP) issues #170

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[rkalis]

Ok I took a look at this PR and made some (small) changes:

• I reverted the .webp changes, as we discussed in Discord, since any images (should) get optimised at runtime by Vercel's image optimsation already
• I reverted some changes that appeared to not provide any real improvements or add too much complexity
• Removed the change to the DonateModal since that was messing up the Modal transitions
• Made some style changes (e.g. default export the new analytics object)

I think we should merge this into master and we can always improve on this down the line. But for now I think there's no low hanging fruit any more that we can tackle to get big improvements.