update js lib waypoints and remove back to top
remove unused images
support text only foods menu

Added a new setting MENU_STYLE.
You can set it to `text` or `image`
add note field to the order
add basic order edit
update source code url from gitbucket to github
edit order
refactor code for create/edit order
update bill layout
update logo and bill page,add qrcode
improve small ui staff
update slogan
Merge branch 'feature/improve_ui' into develop