Android Dark Mode

[v73c]

The main "Latest spots" page (if you will) shows up with the system default of dark mode. However, the other options/pages; Triggers, Limits, and Destinations do not seem to follow the system default. Each of these is a light page/screen.

Could not add an enhancements label.

[manuelkasper]

This is because these pages are actually simply parts of the hamalert.org web based UI being loaded in the app. These web pages do not support dark mode. Eventually we should have a native UI in the app to edit triggers etc. (see #6)