Move existing themes under a default folder

default-themes/base/login/error.ftl

@@ -0,0 +1,13 @@
+<#import "template.ftl" as layout>
+<@layout.registrationLayout displayMessage=false; section>
+    <#if section = "header">
+        ${msg("errorTitle")}
+    <#elseif section = "form">
+        <div id="kc-error-message">
+            <p class="instruction">${message.summary?no_esc}</p>
+            <#if client?? && client.baseUrl?has_content>
+                <p><a id="backToApplication" href="${client.baseUrl}">${kcSanitize(msg("backToApplication"))?no_esc}</a></p>
+            </#if>
+        </div>
+    </#if>
+</@layout.registrationLayout>