[openstreetmap/openstreetmap-website] Update Docker documentation and Dockerfile (PR #4101)

[mmd]

Our CI build installs `ca-certificates` already. Probably it's being pulled in via some dependency. For reference check the raw logs of a recent Docker build: https://github.com/openstreetmap/openstreetmap-website/actions/runs/6036092209/job/16377726247

Quoting a few relevant lines form the logs:

```
[...]
2023-08-31T10:23:53.6007897Z #6 57.00 Selecting previously unselected package ca-certificates.
2023-08-31T10:23:53.7095643Z #6 57.00 Preparing to unpack .../178-ca-certificates_20230311ubuntu0.22.04.1_all.deb ...
2023-08-31T10:23:53.7098764Z #6 57.00 Unpacking ca-certificates (20230311ubuntu0.22.04.1) ...
[...]
2023-08-31T10:24:12.5385253Z #6 75.86 Setting up ca-certificates (20230311ubuntu0.22.04.1) ...
[...]
2023-08-31T10:24:26.7721153Z #6 90.16 Processing triggers for ca-certificates (20230311ubuntu0.22.04.1) ...
2023-08-31T10:24:26.7721468Z #6 90.17 Updating certificates in /etc/ssl/certs...
2023-08-31T10:24:27.3749501Z #6 90.63 0 added, 0 removed; done.
2023-08-31T10:24:27.3750329Z #6 90.63 Running hooks in /etc/ca-certificates/update.d...
2023-08-31T10:24:27.3750741Z #6 90.63 
2023-08-31T10:24:27.6407812Z #6 90.89 done.
[...]
```



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