D11694: Add a dark theme

[Nicolas Fella]

nicolasfella added a reviewer: VDG.

REPOSITORY
  R225 KDE Connect - Android application

BRANCH
  feature/dark-theme

REVISION DETAIL
  https://phabricator.kde.org/D11694

To: philipc, #kde_connect, mtijink, #vdg
Cc: nicolasfella, mtijink, yannux, Danial0_0, johnq, Pitel, adeen-s, SemperPeritus, ahmedbesbes, ndavis, daniel.z.tg, jeanv, seebauer, bugzy, MayeulC, menasshock, ach, apol
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