Replace use of paulczar/omgwtfssl image in examples

[joshtrichards]

That image does not seem to be maintained any longer:

• https://hub.docker.com/r/paulczar/omgwtfssl/
• https://github.com/paulczar/omgwtfssl?tab=readme-ov-file

Even though it's commented out in our example(s), it is in there for self-signed cert usage. We should drop it and, preferably, replace it.

[tzerber]

Maybe this one ?
https://hub.docker.com/r/mgbi/openssl-certs

There's no "similar" and up-to-date container like the one we use in examples and the one i suggested (no idea why i suggested it, it's few years old)

I'm thinking something like this, but it's going a bit further than "easy, copy-pastable solution". What do you think @joshtrichards ?

tzerber@a6a47be