Feature request: Use version "tagging" on Google Docs

[maelle]

Possibly related to #13

On Google Docs one can name versions to "tag" them https://www.techrepublic.com/article/version-history-essentials-for-google-docs-sheets-and-slides/

Maybe trackdown could name a version (for instance the first characters of the hash of the local file) when creating/updating a doc?

[krlmlr]

With tagging, we would be less cautious of overwriting the document, and would have an easier time supporting #47.

Conversely, could we add something to the YAML header of the local .Rmd file to indicate the location of the file in Google Drive?

We could avoid asking if it's okay to overwrite by creating a backup file in the temporary directory.

I'm looking for a "one-stop shop" function that does the right thing without asking any questions.