Auth: Add page to change password.

Configure launcher as a default return to address.

Use standard X-Forwarded-User instead of custom X-User header.
Add X-Forwarded-UserId header holding user unique identificator.

Change-Id: Ib2e6329ba9fb91d2cc9a86b0c5fc78898769e3b8
diff --git a/core/installer/welcome/welcome-tmpl/base.html b/core/installer/welcome/welcome-tmpl/base.html
new file mode 100644
index 0000000..44861de
--- /dev/null
+++ b/core/installer/welcome/welcome-tmpl/base.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html lang="en" data-theme="light">
+    <head>
+        <link rel="stylesheet" href="/stat/pico.2.0.6.min.css">
+        <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/hack-font/3.3.0/web/hack.min.css">
+        <link rel="stylesheet" href="/stat/welcome.css?v=0.0.1">
+        <meta charset="UTF-8">
+        <meta name="viewport" content="width=device-width, initial-scale=1" >
+        <title>Successful Registration</title>
+    </head>
+    <body>
+        <main class="container">
+			{{ block "content" . }}{{ end }}
+        </main>
+    </body>
+</html>