[DOCS-3263] Add GTM tags to JS driver API index

[jrodewig]

Ticket(s): DOCS-3263

Problem

When we publish API ref docs for the JS driver, we don't include GTM tags in the index. The tags let us track traffic to the docs.

Also fixes some copy/paste errors in the docs script from #282

Solution

Update the docs build script to include the tags. Implementation is based on what we use in other drivers. Ex: https://github.com/fauna/fauna-python/blob/main/concourse/scripts/publish_docs.sh

Testing

I don't have access to Concourse so I can't test this myself. However, the publish docs task occurs after the package is published so this won't block releases.

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