adapt to low resolution or portrait screens;

When screen width is less than 1100, the page will scale back to icon
only toolbar buttons and smaller banner;  Fixed local storage estimate
to 5 mb (for most browsers); Modified feature detection for Samples
Browser, Storage Summary... will now sort of run on ipad (ipad has no
indexeddb but does have localstorage... could in theory save progs to
localstorage slots in future).  Ipad doesn't really need another app
environment so may not fully support.