Make view/sign page the primary Legalpad page
Summary:
- Makes the "legal document" page the main page.
- Links to the "manage" page.
- The "manage" operation now requires CAN_EDIT.
- Modernize some crumbs and such.
Test Plan: {F170213}
Reviewers: chad
Reviewed By: chad
Subscribers: epriestley
Differential Revision: https://secure.phabricator.com/D9733