Should we add a version number to documentation pages?

[bparks13]

Would it be helpful to place a version tag on some of the documentation pages to note which version the documentation is guaranteed to be correct for? For instance, any of the pages under User Guide -> Hardware Guides that are generated via manual markdown pages (e.g., Neuropixels GUI documentation) might benefit from having an explicit tag. That way, if we forget to update any of the images or content after a new release, it will be more clear to users to know that specific information might be outdated but the overall content should be correct as of a specific version number.

This could also be automatically tagged in the API documentation based on the current version number, that way we have a consistent theme on each page for what information is being presented.