Feature #2371 Embed use case upgrade demo video into upgrade instructions

Pull Request Testing

[X] Describe testing already performed for these changes:
N/A
[X] Recommend testing for the reviewer(s) to perform, including the location of input datasets, and any additional instructions:

Both reviewers: View documentation changes. Is this a good place to embed the video or should it be moved?

The video is currently in the "How to upgrade" 2.3.1.3 section.

[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 12/8/2023.

See the METplus Workflow for details.

[X] Add any new Python packages to the METplus Components Python Requirements table.
[X] Review the source issue metadata (required labels, projects, 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: Organization level software support Project or Repository level development cycle Project Select: Milestone as the version that will include these changes
[ ] After submitting the PR, select the :gear: icon in the Development section of the right hand sidebar. Search for the issue that this PR will close and select it, if it is not already selected.
[ ] 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.