Vitepress framework update 1.3.1

[wkande]

@dcroote This PR updates the docs to the latest release of Vitepress. I will be closing the renovate PR without merging it as this PR will be its replacement.

Four things to mention here:

1. The framework update resulted in an update to the VPNavBar.vue component
2. OEV was missing from the flex build, I added it
3. Three OEV pages needed fixing
   Two pages had a bad frontmatter path
   Another page was missing the FlexStart and FlexEnd tags
4. Lastly I have created another issue for a possible change to the config.js file. The new Vitepress release now has the ability to add custom components to the NavBar. In the past I had to hack the VPNavBar.vue component to add the search button. I am hoping that this new feature can be used to do so. I only worry about placement. We will see.

[github-actions]

Visit the preview URL for this PR (updated for commit d71c586):

https://vitepress-docs--pr784-framework-update-1-3-62d9vkng.web.app

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[dcroote]

Looks good to me (except the search results, but I know that's tied to how the files are pulled).