[openstreetmap/openstreetmap-website] Add light/dark mode preference (Issue #5324)

[pkrasicki]

Here's a simple UI proposal:
![osm-theme-settings](https://github.com/user-attachments/assets/19cd3bdd-45cd-407a-9b83-84224fed1368)

Dark theme toggle depends on system settings (just like now), but user can override it by pressing the toggle button in top left corner. The setting will be remembered in local storage. The map theme is set to Auto by default, which means it follows website's theme. But users can override that by selecting Light or Dark.

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