For view project pages by custom pretty link select «Routing» item in sidebar.

While routing is off every HTML and JSON file can be access by your absolute path. If routing is on, you can view HTML and JSON file only if it contains in routing list.

At the left side write url (begin from «/»)
for main page use only «/»

At the rigth side write path to file.
You can write GET parameters and use it in template engine.