Improved assets

assets/images/amoled@220.png

assets/images/amoled@266.png

assets/images/amoled@335.png

assets/images/amoled@352.png

assets/images/amoled@532.png

assets/images/amoled@thumb.jpg

assets/images/desktop@1180.png

assets/images/desktop@363.png

assets/images/desktop@474.png

assets/images/desktop@590.png

assets/images/desktop@726.png

assets/images/desktop@948.png

assets/images/desktop@thumb.jpg

assets/images/generate_resolution.sh

assets/images/generate_thumb.sh

assets/images/gruvbox_dark@220.png

assets/images/gruvbox_dark@266.png

assets/images/gruvbox_dark@335.png

assets/images/gruvbox_dark@352.png

assets/images/gruvbox_dark@532.png