In jst and ndcode_site, implement ES6 classes syntax

diff --git a/jst b/jst
index c033c0d..01c2d8b 160000 (submodule)
--- a/jst
+++ b/jst
@@ -1 +1 @@
-Subproject commit c033c0df6a6daa117027fbbe3d775611f9eca541
+Subproject commit 01c2d8b85153cfda90524a2aa4ab04e4f2f6511d

diff --git a/ndcode_site b/ndcode_site
index 1b29347..f5f3698 160000 (submodule)
--- a/ndcode_site
+++ b/ndcode_site
@@ -1 +1 @@
-Subproject commit 1b2934748ba4e2f3ab57c4154ed7343e3a4ae68a
+Subproject commit f5f3698d9d1077dc6d47b24b247ff5bb6f03b360