Adds <noscript> to PolyGerritIndexHtml.soy

This adds a note that JS is required to use PolyGerrit.

Change-Id: Ic53ae07b4addb3fba35762d85b580403a4c21659
diff --git a/gerrit-httpd/src/main/resources/com/google/gerrit/httpd/raw/PolyGerritIndexHtml.soy b/gerrit-httpd/src/main/resources/com/google/gerrit/httpd/raw/PolyGerritIndexHtml.soy
index eed6ccc..99c3454 100644
--- a/gerrit-httpd/src/main/resources/com/google/gerrit/httpd/raw/PolyGerritIndexHtml.soy
+++ b/gerrit-httpd/src/main/resources/com/google/gerrit/httpd/raw/PolyGerritIndexHtml.soy
@@ -27,6 +27,10 @@
   <meta name="description" content="Gerrit Code Review">{\n}
   <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0">{\n}
 
+  <noscript>
+    To use PolyGerrit, please enable JavaScript in your browser settings, and then refresh this page.
+  </noscript>
+
   {if $canonicalPath != ''}
     <script>window.CANONICAL_PATH = '{$canonicalPath}';</script>{\n}
   {/if}