docs: update onboarding steps for Go v3 client

[karel-rehor]

Updates the onboarding steps for Go v3 client

Checklist

Authors and Reviewer(s), please verify the following:

• A PR description, regardless of the triviality of this change, that communicates the value of this PR
• Well-formatted conventional commit messages that provide context into the change
• Documentation updated or issue created (provide link to issue/PR)
• Signed CLA (if not already signed)
• Feature flagged, if applicable

[bednar]

From my point of view, this looks good, and along with the new API for the client. Great job! 👍

[karel-rehor]

I've decided to go ahead with changes only to GO and will update Java onboarding in another branch. I'd rather we get this part of the UI updated ASAP instead of possibly having it held until January because of 1) Christmas Holidays 2) Unexpected obstacles in updating onboarding for Java.

BTW. Not sure what to do about the monitor-ci-tests and remocal. It seems there is an issue in the underlying system deployment apparently unrelated to these changes.

https://output.circle-artifacts.com/output/job/322ce1ff-e9f2-4414-9ebc-59ed3049eddd/artifacts/0/tests/e2e-remocal/e2e-test-remocal-deploy.log

Time limit has been exceeded. Giving up! Listing status of all pods:

NAME                                                              READY   STATUS             RESTARTS        AGE
annotationd-7b48589d76-n9g4w                                      1/1     Running            1 (8m7s ago)    8m8s
...
gateway-external-meta-595c495797-lw6fr                            0/1     CrashLoopBackOff   6 (107s ago)    8m10s
gateway-external-write-bbc4f748b-x9sj8                            0/1     CrashLoopBackOff   6 (107s ago)    8m11s
gateway-internal-meta-7584495fbf-8dclw                            0/1     CrashLoopBackOff   6 (110s ago)    8m10s
gateway-internal-write-744cf85dc8-89fdh                           0/1     CrashLoopBackOff   6 (2m1s ago)    8m11s
...
redpanda-0                                                        0/1     ImagePullBackOff   0               8m48s
...
storage-0                                                         0/1     CrashLoopBackOff   6 (2m14s ago)   8m11s
storage-1                                                         0/1     CrashLoopBackOff   6 (101s ago)    8m7s
...
Gathering ingress logs
Creating archive

[david-rusnak]

Hi @karel-rehor, sorry for the delay on this - I was working on fixing the CI pipeline and I see it has passed the tests now. I'll take a look at this PR in more detail tomorrow. Thank you!