Copied _site_header.html from theme gem into project

Author: djanelle-mit

app/views/layouts/_site_header.html.erb

@@ -0,0 +1,22 @@
+<div class="wrap-outer-header layout-band <%= 'reasons' if params[:rainbows] %>">
+  <div class="wrap-header">
+    <header class="header-site header-slim" role="banner">
+      <div class="wrap-header-core">
+        <h1 class="name-site group nav-logo">
+          <a href="https://libraries.mit.edu/" class="logo-mit-lib">
+            <span class="sr">MIT Libraries home</span>
+            <img src="https://cdn.libraries.mit.edu/files/branding/local/mitlib-wordmark.svg" height="35" alt="MIT Libraries logo">
+          </a>
+          <% if ENV['PLATFORM_NAME'] %>
+            <a href="/" class="platform-name"><%= ENV.fetch('PLATFORM_NAME') %></a>
+          <% end %>
+        </h1>
+      </div>
+      <div class="wrap-header-supp">
+        <a class="link-logo-mit" href="https://www.mit.edu"><span class="sr">MIT</span>
+          <img src="https://cdn.libraries.mit.edu/files/branding/local/mit_logo_std_rgb_white.svg" height="35" alt="MIT logo" >
+        </a>
+      </div>
+    </header>
+  </div>
+</div>