webclient page scaleable, login page device-width

[will-moore]

I noticed that the webclient login page is really not very mobile-phone friendly as the whole page shrinks to be quite small.

At the same time, the main webclient page is completely unusable on a phone as it is NOT scaleable and you can't access the centre & right areas of the page.
This is because it has the user-scalable=no flag on the <viewport>
which is "against Web Content Accessibility Guidelines" see https://developer.mozilla.org/en-US/docs/Web/HTML/Viewport_meta_tag

Using Chrome dev tools to emulate a phone E.g. a Google Pixel 4.

Before this PR: login page is tiny and webclient page is unusable:

After these changes, the login page is a useful size (but still scalable) and the webclient page is usable as you can zoom (rescale) and pan around the page to access all functionality:

[knabar]

Looks good