In logjson and ndcode_site, implement log file rotation

diff --git a/logjson b/logjson
index e4630e0..f49021c 160000 (submodule)
--- a/logjson
+++ b/logjson
@@ -1 +1 @@
-Subproject commit e4630e08a36567abc781f6455fadb06dc63a6350
+Subproject commit f49021c54bdf2f119bd9be07a77c034058c95c2c

diff --git a/ndcode_site b/ndcode_site
index 19bf677..1b29347 160000 (submodule)
--- a/ndcode_site
+++ b/ndcode_site
@@ -1 +1 @@
-Subproject commit 19bf677e98514f16e77e18f9bbbfbcc5a0cc6ba2
+Subproject commit 1b2934748ba4e2f3ab57c4154ed7343e3a4ae68a