In ndcode_site, change main page, to make it slightly less opinionated, and refer...

diff --git a/ndcode_site b/ndcode_site
index 70cddeb..6e09f33 160000 (submodule)
--- a/ndcode_site
+++ b/ndcode_site
@@ -1 +1 @@
-Subproject commit 70cddeb3af7d729d4cfcb6ff3c0d490542b956b5
+Subproject commit 6e09f33c741b1afd847423fcb97b4d1a95453576