added site.jyear

(cherry picked from commit 5176ced20015f67d6366271b08a2b823e71122ff)
modified _layout/default.html
modified about.html

(cherry picked from commit 23907ac3aad0a86b3542c7c59981deee2f45b2bc)
modified sources.html

(cherry picked from commit 394c0f97b29b05e9aedc11579f84243e958f0bc4)
modified sources.html

(cherry picked from commit 0af8a9c83cf8d23236be014fbcbca1d736f5f926)
modified team.html

(cherry picked from commit f198b4ebf5ffb350ca75445e1f6e68b147890508)