Enables React Router's intent-based prefetching on Link components
across the app, preloading route data and modules on hover/focus
for faster perceived navigation.
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.
ephraimduncan
David Nguyen
Catalin Pit
Lucas Smith
Catalin Pit