[webapp] pre-work for beta

Signed-off-by: Juha Kallioinen <juha.kallioinen@jolla.com>
[webapp] re-arrange targets page and use redirect back

Signed-off-by: Juha Kallioinen <juha.kallioinen@jolla.com>
[systemd] run the webserver in production mode

Signed-off-by: Juha Kallioinen <juha.kallioinen@jolla.com>
Merge pull request #6 from sailfish-sdk/betastuff

Improvements in webapp layout