Feature #183, added screenshots to install and uninstall instructions

[georgemccabe]

Closes #183

Expected Differences

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

Pull Request Testing

• [X] Describe testing already performed for these changes:
  

Reviewed documentation updates

• [X] 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

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

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

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

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

Pull Request Checklist

• [X] Review the source issue metadata (labels, project, and milestone).
• [X] Complete the PR definition above.
• [X] Ensure the PR title matches the feature or bugfix branch name.
• [X] Define the PR metadata, as permissions allow. Select: Reviewer(s) Select: Project Select: Milestone as the version that will include these changes Select: Development to link to the original development issue.
• [ ] After the PR is approved, merge your changes. If permissions do not allow this, request that the reviewer do the merge.
• [ ] Close the linked issue and delete your feature or bugfix branch from GitHub.