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This PR adds multiple themes to the root layout, that are automatically applied based on the sun's location in relation to the user.
The user's location is retrieved from the country code that Cloudflare Workers exposes as a header, which are converted to rough geocoordinates based on this table by Google.
Combining the geocoordinates and the current time allows us to calculate the sun's azimuth and altitutde to set a theme (eg. night, dusk, sunrise, noon, etc.).
The theme determines the background image and the accent colors for links, etc.