[docs] [metrics] Return the old exemplars sample

[ImoutoChan]

Package

None

Is your feature request related to a problem?

No response

What is the expected behavior?

Right now the sample in /docs/metrics/exemplars is unusable, it requires you to install and run locally all dependencies and too verbose.

The old version https://github.com/open-telemetry/opentelemetry-dotnet/tree/b0c95307dd4bb0cab17f07c177773592816ddc09/docs/metrics/exemplars was much better and simpler. It also had sample working otel-collector configuration which is usually used in production envs.

Which alternative solutions or features have you considered?

If you want to retain this new version, at least return the old one to the separate folder, for example: /docs/metrics/exemplars-using-docker-compose. I spent a lot of time trying to find the old tutorial.

Additional context

No response