[openstreetmap/openstreetmap-website] Change the way notifications about messages appear (PR #4070)

[Dimitar]

@gravitystorm suggested using `bg-info` which is more cyan than blue. `bg-primary` would work better since it's actually blue and should stand out more. I will add a screenshot with that variant tommorow.

For reference, these are the standard colours supported by Bootstrap 5:
![Screenshot_20230708_115940.jpg](https://github.com/openstreetmap/openstreetmap-website/assets/19364673/7570cfb4-1586-4dab-952b-4aca8267f9e9)



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