Fix dead links to tutorials
tree05f64307e74e363f43efe5da552d679a21810251
-rw-r--r-- 18787 COPYING
drwxr-xr-x - cogito
drwxr-xr-x - course
-rw-r--r-- 164 favicon.png
-rw-r--r-- 275 git-logo.png
-rw-r--r-- 16925 index.html
drwxr-xr-x - stylesheets
-rwxr-xr-x 780 update.sh