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

[Paul Norman]

> It is generally agreed that red is used for notifications (see the [old facebook design](https://img.freepik.com/free-vector/facebook-notification-icons_23-2147675572.jpg), [iOS](https://i.stack.imgur.com/hx1fz.png) and [Android](https://i.stack.imgur.com/i3SS9.jpg)). `bg-info` could work but it seems like it may be less visible.

Github, Twitter (I think), and Mastedon use blue.

![image](https://github.com/openstreetmap/openstreetmap-website/assets/1190866/40ebb4de-e2f2-4e9c-813b-8f2d0aa39b16)
![image](https://github.com/openstreetmap/openstreetmap-website/assets/1190866/5dd10e66-0a36-494b-ac78-53e100f51d1a)

Facebook uses red in places, blue in others.
![image](https://github.com/openstreetmap/openstreetmap-website/assets/1190866/f8ce0523-f366-4ed5-b875-1bd01e2b2eb9)

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