Moved tab views into app/client
Fixed file references in grouped-timeseries and realtime tests
Changed `link` property to `href`

Mustache was recognising `link` as being a function on a string (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/link) so was calling it, and so had a weird embedding of a `<a href="...">...</a>` into the href property.

Changing to href resolves this.