Add parentId query param support to documents/templates folder index
pages so View All correctly shows subfolders. Fix search not filtering
unpinned folders on documents page and broken mt- Tailwind class on
templates page.
This PR is handles the changes required to support envelopes. The new
envelope editor/signing page will be hidden during release.
The core changes here is to migrate the documents and templates model to
a centralized envelopes model.
Even though Documents and Templates are removed, from the user
perspective they will still exist as we remap envelopes to documents and
templates.
