Move all presentation into client-side

[rokstrnisa]

Whenever a user visits a page (i.e. url), the interaction between the client (browser, in JavaScript) and the server (in OCaml) should follow these steps:

• The server returns a very basic HTML page that includes a reference to the JavaScript script.
• The client downloads the referenced JavaScript (normally already cached in the browser).
• The script then creates async JavaScript requests to the server based on url.
• The server replies to async requests only with data in JSON format.
• The client uses the data to generate the user interface.

Any further interaction with the page should also create JavaScript async requests.