Demo here: https://billmei.github.io/mobile-notes
Built with Backbone.js, jQuery, and Bootstrap.
This is a client-side app serving static assets, so you can run from the root folder with an HTTP fileserve after you did git clone. You can use any language for the HTTP fileserve but I like to use python because it's easy:
$ python -m SimpleHTTPSever
You can then visit localhost:8000 in your browser (or whatever other port you specified) to view the app.
To visit the app from your phone, make sure your phone and your computer are connected to the same wifi router, then run ifconfig or some other tool to find the local IP address of your desktop. Now visit port 8000 from your mobile phone web browser, for example: 192.168.1.xxx:8000.