update emacs configuration

Signed-off-by: Micky Ching <mickyching@gmail.com>
add pro git book

Signed-off-by: Micky Ching <mickyching@gmail.com>
add algorithm notes

Signed-off-by: Micky Ching <mickyching@gmail.com>
org mode add notes

Signed-off-by: Micky Ching <mickyching@gmail.com>
emacs add notes

Signed-off-by: Micky Ching <mickyching@gmail.com>