Document how to deploy the Open Telemetry collector

[dmartinol]

I guess it should work using the Red Hat build of OpenTelemetry operator, but it's worth to document or implement the procedure.

[MichaelClifford]

Closed by #103

[frzifus]

Depends on what exactly is to be documented.

This PR shows the usage of the target-allocator (docs) as a replacement for the sidecar deployments.

• k8s: provide otel target-allocator example #103

This PR shows the configuration of multiple OTEL SDKs using the instrumentation CR.

• k8s: configure otel sdk via instrumentation cr #107