Feature #183, added screenshots to install and uninstall instructions

[georgemccabe]

Closes #183

Expected Differences

• Do these changes modify the system output in any way? [No]
  

Pull Request Testing

• Describe testing already performed for these changes:
  

Reviewed documentation updates

• Recommend testing for the reviewer(s) to perform, including the location of input datasets, and any additional instructions:
  

Review documentation updates and screenshots. Rendered content can be found here:
https://wrfcloud.readthedocs.io/en/feature_183_screenshots/Users_Guide/installation.html

• Do these changes include sufficient documentation updates, ensuring that no errors or warnings exist in the build of the documentation? [Yes]

• Do these changes include sufficient testing updates? [Yes]

• Will this PR result in changes to the test suite? [No]
  

• Please complete this pull request review by 7/10/2023.
  

Pull Request Checklist

• Review the source issue metadata (labels, project, and milestone).
• Complete the PR definition above.
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  Select: Reviewer(s)
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[fossell]

The screen shots are a great addition, the text overlay directions are clear and helpful. Looks good!