[IDP] IDP Doc Changes

[khushisharmaharness]

Changes:

• Custom plugin config
• IDP stage images
• IDP stage steps (run and plugin)
• Removing output from steps example
• Updated plugins marketplace screenshots (and upvote docs)

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Description

• Please describe your changes: __________________________________
• Jira/GitHub Issue numbers (if any): ______________________________
• Preview links/images (Internal contributors only): __________________

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