Add docs for JS vimeo plugin

[greg-el]

This PR adds docs for the Vimeo tracking plugin.

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[stanch]

It really worries me that we have so much duplication. In any case, all comments above apply here as well. It would be great if you could make a single reusable page and import it into both of these pages. Reusable pages can have parameters. Feel free to slack me if you need help

[matus-tomlein]

Just to note, we plan to merge the two sets of pages for the browser and tag tracker into one while adding a tabbed interface on snippets to switch between them so it might be better to publish this as is to make it easier to merge then (I think @mscwilson is planned to work on this). Reusable fragments would work too (and that's what we use in the media plugin docs), just might be unnecessary given the planned work.

[matus-tomlein]

LGTM!

[matus-tomlein]

Just to note, we plan to merge the two sets of pages for the browser and tag tracker into one while adding a tabbed interface on snippets to switch between them so it might be better to publish this as is to make it easier to merge then (I think @mscwilson is planned to work on this). Reusable fragments would work too (and that's what we use in the media plugin docs), just might be unnecessary given the planned work.