SimaRaha

Add Pictogram Bar Chart Tested and Improvements

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This pull request includes the file plotly-universities-1.ipynb, which demonstrates and tests the pictogram bar chart functionality with various datasets.

Example 2 for Butterfly chart (version2)

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Please uncomment this block and take a look at this checklist if your PR is making substantial changes to **documentation**/impacts files in the `doc` directory. Check all that apply to...

Update horizontal-bar-charts.md

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An example of a butterfly chart/diverging bar chart has been added.