feat: restyle unauthenticated screens (#1103)

I wanted to give the no-auth screens a new look. Here's what I ended up with:

![image](/attachments/d272f36b-03c1-40ca-91f6-30f34e03e5fd)

The image is something we could change with every release.

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/1103
Reviewed-by: Dominik Pschenitschni <dpschen@noreply.kolaente.de>
Co-authored-by: konrad <k@knt.li>
Co-committed-by: konrad <k@knt.li>

src/router/index.js

@@ -105,21 +105,33 @@ const router = createRouter({
 			path: '/login',
 			name: 'user.login',
 			component: LoginComponent,
+			meta: {
+				title: 'user.auth.login',
+			},
 		},
 		{
 			path: '/get-password-reset',
 			name: 'user.password-reset.request',
 			component: GetPasswordResetComponent,
+			meta: {
+				title: 'user.auth.resetPassword',
+			},
 		},
 		{
 			path: '/password-reset',
 			name: 'user.password-reset.reset',
 			component: PasswordResetComponent,
+			meta: {
+				title: 'user.auth.resetPassword',
+			},
 		},
 		{
 			path: '/register',
 			name: 'user.register',
 			component: RegisterComponent,
+			meta: {
+				title: 'user.auth.register',
+			},
 		},
 		{
 			path: '/user/settings',