Adding simple rgb tutorial to the tutorial gallergy

[annacasto]

Describe your changes Adding a simple RGB workflow to the tutorial gallery. This tutorial is a straight-forward computer vision workflow and contains references to other workflows with options for more complexity.

Type of update Is this a:

• New feature or feature enhancement

Associated issues None

Additional context

For the reviewer See this page for instructions on how to review the pull request.

• [x] PR functionality reviewed in a Jupyter Notebook
• [x] All tests pass
• [x] Test coverage remains 100%
• [x] Documentation tested
• [x] New documentation pages added to plantcv/mkdocs.yml
• [x] Changes to function input/output signatures added to updating.md
• [x] Code reviewed
• [ ] PR approved

[deepsource-io[bot]]

Here's the code health analysis summary for commits 8e34132..f6d1781. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
Python	✅ Success		View Check ↗
Test coverage	✅ Success		View Check ↗

Code Coverage Report

Metric	Aggregate	Python
Branch Coverage	100%	100%
Composite Coverage	99.7%	99.7%
Line Coverage	99.7%	99.7%

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[annacasto]

Keely, I updated the index.ipynb notebook with the optional color correction step, so it should be all set for final review now.

[annacasto]

Fixed typos and added some more context

[annacasto]

Fixed the title of the tutorial and added Workflow Inputs

[nfahlgren]

@annacasto could you rerun the notebook and sync it to the tutorial repo? Currently it is rendered with an error: