Added details on configuring stage/step status rule

[JimHagan]

This PR adds important on:

• how to interpret the status of stages and steps
• how to use the new configuration UI to change the rules by which status are computed

[github-actions]

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[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
2 out of 3 committers have signed the CLA.

✅ aso1124
✅ JimHagan
❌ nbaenam

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[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

✅ JimHagan
❌ aso1124
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[nbaenam]

Hi @JimHagan, thank you for updating this! I did some style edits. Let me know what you think and I'll merge it in!

[JimHagan]

@nbaenam It looks like you haven't signed the CA for this repo? Please merge when ready.