New login screen (#1331)

* wip

* feat: first draft of auth.config

* chore: auth methodS

* chore: styling

* styling, styling, styling

* feat: Auth notices

* chore: Remove server-rendered pages, move shared/components -> components

* lint

* cleanup

* cleanup

* fix: Remove unused component

* fix: Ensure env variables in prod too

* style tweaks

* fix: Entering SSO email into login form fails
fix: Tweak language around guest signin

README.md

@@ -126,7 +126,6 @@ Backend is driven by [Koa](http://koajs.com/) (API, web server), [Sequelize](htt
 - `server/commands` - Domain logic, currently being refactored from /models
 - `server/emails`  - React rendered email templates
 - `server/models` - Database models
-- `server/pages` - Server-side rendered public pages
 - `server/policies` - Authorization logic
 - `server/presenters` - API responses for database models
 - `server/test` - Test helps and support