I only put it in one page, so you can see the difference. AFAIK It force the device no t to try to display like it where a desktop.

    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
    <meta name="description" content="">
    <meta name="author" content="">
    <link rel="icon" href="../../favicon.ico">

So maybe we will have to put it ikiwiki master layout (I don't know if/how it's possible)