Cleanup pipeline runner instructions

[danistrebel]

Description

What's changed, or what was fixed?

• Explicitly state the local pipeline runner instructions instead of hiding it in the package.json
• Remove root package.json

Housekeeping

(please check all that apply [x], do not edit the text)

• [x] I have run all the tests locally and they all pass.
• [x] I have followed the relevant style guide for my changes.
• [ ] PR requires full pipeline run (Run for changes only by default).

CC: @apigee-devrel-reviewers

[danistrebel]

/gcbrun

[apigee-devrel-bot]

Pipeline Report

Pipeline	Result	Elapsed Wall Time
TOTAL PIPELINE (no change)	pass	0

View details in Cloud Build (permission required)

Commit version: af259cc

[danistrebel]

/gcbrun

[apigee-devrel-bot]

Pipeline Report

Pipeline	Result	Elapsed Wall Time
references/cicd-pipeline	pass	447s
TOTAL PIPELINE	pass	447s

View details in Cloud Build (permission required)

Commit version: 665cf58