docs(webhook): add documentation for webhook feature

[cjcocokrisp]

Adds documentation for the webhook feature.

Changes:

• Updates the run page with new webhook related flags
• Adds the documentation for webhook command
• Adds a configuration page with information about configuring the webhook
• Removed some flags that I realized were not used from the run command

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.05%. Comparing base (7ef756e) to head (30a5f08).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1207      +/-   ##
==========================================
- Coverage   63.08%   63.05%   -0.03%     
==========================================
  Files          23       23              
  Lines        3142     3140       -2     
==========================================
- Hits         1982     1980       -2     
  Misses       1050     1050              
  Partials      110      110              

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[cjcocokrisp]

Altered the example url to be app1.example.com.

[chengfang]

all the new command flags can also be specified via env var, and we may want to document this capability too.

[chengfang]

How about also include a sample webhook event payload?

During your testing, have you seen issues with not receiving expected events due to various configuration such as unmatched secret, incorrect port, etc? If so, can you also include them in a troubleshooting section?

[cjcocokrisp]

How about also include a sample webhook event payload?

During your testing, have you seen issues with not receiving expected events due to various configuration such as unmatched secret, incorrect port, etc? If so, can you also include them in a troubleshooting section?

Yeah sure I can add a sample webhook event payload. The payloads vary from each of the container registries so do you think having an example specifically shown would be good or just links to the documentation for each of the registries would be suffice?

For troubleshooting, I can definitely add a section that shows errors that you might receive as well.

[chengfang]

having an example specifically shown would be good or just links to the documentation for each of the registries would be suffice?

links should suffice; if links not available, then include a sample payload from one of the registries will be good too.

[cjcocokrisp]

Added those two sections. Let me know what you think.