[docs] Move docker related files to examples folder

[reyang]

Related to #5636 (comment).

@cijothomas and I had some discussion offline, these are something we might want to explore:

1. Change the current ASP.NET Core 7.0 example to Aspire micro-service.
2. Use the Aspire dashboard to show OTLP traffic (which covers logs/metrics/traces).
3. Use Jaeger/Prometheus/OpenSearch/Grafana to demonstrate a vendor agnostic deployment (a mini version of the opentelemetry-demo).

[cijothomas]

We need to update the readme (https://github.com/open-telemetry/opentelemetry-dotnet/blob/main/examples/AspNetCore/README.md) to mention that there is a docker compose? Okay to do it separately, as the docker-compose file needs changes to install jaeger instead of tempo..
Don't think we want to block this PR.

[cijothomas]

we need more works to make this useable for most users, but that come later. (I might be able to help make that change myself)