feat: fix header position

[ConradOsvik]

This qol update does the following:

• Changes header from sticky to fixed
• Makes the content of the home page h-screen instead of h-screen - header height

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
kont-res	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 12, 2024 5:01pm