Support theme-color for Android 5

https://wikia-inc.atlassian.net/browse/HG-486
it's a nice feature to have,
colors won't change overnight

if we move back to orignal sass (and we will investigate that) we could use:
https://github.com/vigetlabs/sass-json-vars

then we could create colors.json and use this in JS and SASS

but to me it's good for now, for Now