app: unify pre-maintenance banner with other site-wide banners

app/assets/stylesheets/_maintenance.scss

@@ -1,15 +0,0 @@
-.maintenance {
-  width: 100%;
-  position: fixed;
-  top: 0;
-  z-index: 100;
-  display: flex;
-  flex-direction: column;
-  justify-content: center;
-
-  span {
-    margin: auto;
-    background: #FFD8A6;
-    padding: 0 4px;
-  }
-}

app/assets/stylesheets/application.scss

@@ -9,7 +9,6 @@
 // defined in the other CSS/SCSS files in this directory. It is generally better to create a new
 // file per style scope.
 //
-// = require _maintenance
 // = require _card
 // = require _helpers
 // = require _turbolinks

app/assets/stylesheets/new_design/_maintenance.scss

@@ -1,8 +0,0 @@
-@import "colors";
-
-.maintenance {
-  padding: 20px;
-  text-align: center;
-  width: 100%;
-  background: $orange-bg;
-}

app/assets/stylesheets/new_design/site_banner.scss

@@ -9,6 +9,10 @@
   background-color: $yellow;
   border-bottom: 1px dashed rgba(0, 0, 0, 0.6);
 
+  &.warning {
+    background-color: $orange-bg;
+  }
+
   .container {
     display: flex;
     align-items: center;

app/assets/stylesheets/site_banner.scss

@@ -6,6 +6,10 @@
   background-color: #FEF3B8;
   border-bottom: 1px dashed rgba(0, 0, 0, 0.6);
 
+  &.warning {
+    background-color: #FFD8A6;
+  }
+
   .container {
     display: flex;
     width: auto;

app/views/layouts/_main_container.html.haml

@@ -1,6 +1,7 @@
 #main-container{ class: "col-xs-#{main_container_size}" }
   .row
     = render partial: 'layouts/outdated_browser_banner'
+    = render partial: 'layouts/pre_maintenance'
   .row
     = render partial: 'layouts/flash_messages'
   .row

app/views/layouts/_pre_maintenance.html.haml

@@ -1,4 +1,9 @@
 - if feature_enabled?(:pre_maintenance_mode)
-  .maintenance
-    %span
-      Une opération de maintenance est prévue sur demarches-simplifiees.fr à 23 h 00. La plateforme sera inaccessible pendant une vingtaine de minutes.
+  .site-banner.warning
+    .container
+      .site-banner-icon 🕚
+      .site-banner-text
+        %strong
+          Une opération de maintenance est prévue sur demarches-simplifiees.fr à 23 h 00.
+        %br
+        La plateforme sera inaccessible pendant une vingtaine de minutes.

app/views/layouts/application_old.html.haml

@@ -19,7 +19,6 @@
     = Gon::Base.render_data(camel_case: true, init: true)
 
   %body{ class: browser.platform.ios? ? 'ios' : nil }
-    = render partial: 'layouts/pre_maintenance'
     - if staging?
       #beta
         Env Test