Feat/perf optimisations

[ddembo]

What's changed?

Testing some perf tweaks:

• lazy load GA script
• add sharp image optimisation (recommended by Next for production apps)
• add sizes to main image on home page

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Name	Status	Preview	Comments	Updated (UTC)
tdn-web-next	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 15, 2023 9:28am

[ddembo]

Verified improvements manually in lighthouse