Improved assets

assets/images/solarized_light@335.png

assets/images/solarized_light@352.png

assets/images/solarized_light@532.png

assets/images/solarized_light@thumb.jpg

assets/images/tablet@1090.png

assets/images/tablet@1635.png

assets/images/tablet@2180.png

assets/images/tablet@545.png

assets/images/tablet@640.png

assets/images/tablet@720.png

assets/images/tablet@800.png

assets/images/tablet@880.png

assets/images/tablet@960.png

assets/images/tablet@thumb.png

assets/images/themes@1180.png

assets/images/themes@363.png

assets/images/themes@474.png

assets/images/themes@590.png

assets/images/themes@726.png

assets/images/themes@948.png