index: Refresh with current plans.

* Note work on the reimbursement system.
* Streamline ways to help.
* Remove Phase 1 plans for now, since they're less reflective of the
current approach. A lot of the materials are still relevant, but we
need to figure out a better presentation for them, and they're not
critical now.

Change "In Progress" state to "Draft".

Payment requests are basically always "in progress" until they're
rejected or the requestor receives payment. Use a name that better
reflects what's going on.

Policy validation can wait until after the first release.

The policy validations that would help reduce back and forth most are
the ones that are hard to implement: checking that attachments
actually include the necessary information, checking that per diems
match limits, etc. Building to be able to accommodate these is going
to take time, and we don't need to make all that investment for the
first release.

Pre-approval can wait until after the first release.

This is a very valuable feature, and we want it soon, but it doesn't
have to be in literally the first release.