docs: update emojivoto example

[JamieDanielson]

This updates the emojivoto example in the getting-started docs:

• Remove launcher, which is no longer needed after Allocate memory without launcher #40
• Update instrumentation to use otel-go-instrumentation image instead of keyval/otel-go-agent
• Simplify paths to kubernetes manifests (use relative instead of absolute)

Note: This instruments gRPC but has the issue referenced in #78 . Also, the docker image has not yet been published so this currently requires a local build. Since those are already known issues, I think this is worth merging in anyway - I'm not sure how helpful it is to show an example of the instrumentation if it's not actually instrumentation from this library.

{"level":"error","ts":1682967887.022351,"caller":"instrumentors/runner.go:88","msg":"error while loading instrumentors, cleaning up","name":"google.golang.org/grpc","error":"field UprobeHttp2ClientCreateHeaderFields: program uprobe_Http2Client_CreateHeaderFields: load program: permission denied: 912: (73) *(u8 *)(r10 -196) = r7: 913: (79) r2 = *(u64 *)( (truncated, 1185 line(s) omitted)","stacktrace":"go.opentelemetry.io/auto/pkg/instrumentors.(*Manager).load\n\t/app/pkg/instrumentors/runner.go:88\ngo.opentelemetry.io/auto/pkg/instrumentors.(*Manager).Run\n\t/app/pkg/instrumentors/runner.go:36\nmain.main\n\t/app/cli/main.go:86\nruntime.main\n\t/usr/local/go/src/runtime/proc.go:250"}

[MikeGoldsmith]

Looks good for me. Made a suggestion to require the docker image be created locally as part of the example until an official image is available.

[MikeGoldsmith]

Thanks @JamieDanielson - just needs a changelog entry 👍🏻

[JamieDanielson]

Thanks @JamieDanielson - just needs a changelog entry 👍🏻

Happy to add, but wasn't sure it needed one since it's just an example update.

[MikeGoldsmith]

Ah, true - we can skip changelog!