fix: update link (#20)

src/theme/login/login.ftl

@@ -51,7 +51,7 @@
         feedback.outerHTML = [
             '<div class="alert alert-info cac-info">',
             '<h2>New DoD PKI Detected</h2>',
-            '<div style="line-height: 2rem;">If you do not have an account yet, <a href="/register">click to register</a> now.  Otherwise, please login with your username/password to associate this CAC with your existing account.',
+            '<div style="line-height: 2rem;">If you do not have an account yet, <a href="${url.registrationUrl}">click to register</a> now.  Otherwise, please login with your username/password to associate this CAC with your existing account.',
             '</div></div>'
         ].join('');
     }