feat: dedicated login page for oauth2 logins

templates/_partials/_logo.html.twig

@@ -0,0 +1,15 @@
+{# The brand logo, extracted from _header.html.twig so the OAuth2 login chrome can show the same
+   logo without inheriting the account links that go with it. Takes an optional `accommodation`. #}
+{# The operating entity depends on where the accommodation is, so its logo wins over the host's #}
+{% set country_logo = accommodation|default(null) and accommodation.country ? accommodation.country.logo : null %}
+{% if country_logo %}
+    <img src="{{ asset('build/images/' ~ country_logo) }}" alt="" class="h-14 my-1 w-auto">
+{% elseif booking_theme() == 'sbw' %}
+    <img src="{{ asset('build/images/logo_sbw.svg') }}" alt="" class="h-10 my-2 w-auto">
+{% elseif booking_theme() == 'ser' %}
+    <img src="{{ asset('build/images/logo_ser.svg') }}" alt="" class="h-10 my-2 w-auto">
+{% elseif booking_theme() == 'snz' %}
+    <img src="{{ asset('build/images/logo_snz.svg') }}" alt="" class="h-10 my-2 w-auto">
+{% else %}
+    <img src="{{ asset('build/images/logo_ep.svg') }}" alt="" class="h-10 my-2 w-auto">
+{% endif %}