Remove matplotlib from conda requirements.

[0mdc]

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Motivation and Context

This changeset removes the matplotlib dependency from the conda build requirements. This dependency includes many others that are likely to conflict with an environment.

How Has This Been Tested

Tutorials that used matplotlib now use pillow to create images. These were tested manually.

Types of changes

• [x] Docs change / refactoring / dependency upgrade
• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have completed my CLA (see CONTRIBUTING)
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.