Disable Authentication & Login Page Rework (#619)

* Implemented the ability to disable authentication on a server instance. Admins will require authentication, but non-admin accounts can be setup without any password requirements.

* WIP for new login page.

* Reworked code to handle disabled auth better. First time user flow is moved into the user login component.

* Removed debug code

* Removed home component, shakeout testing is complete.

* remove a file accidently committed

* Fixed a code smell from last PR

* Code smells

UI/Web/src/app/admin/settings.service.ts

@@ -35,4 +35,8 @@ export class SettingsService {
   getOpdsEnabled() {
     return this.http.get<boolean>(this.baseUrl + 'settings/opds-enabled', {responseType: 'text' as 'json'});
   }
+
+  getAuthenticationEnabled() {
+    return this.http.get<boolean>(this.baseUrl + 'settings/authentication-enabled', {responseType: 'text' as 'json'});
+  }
 }