Move recipes to categories

README.md

recipes/backends/cairo/recipe.sh

recipes/backends/cairo/redox.patch

recipes/backends/pango/recipe.sh

recipes/backends/pango/redox.patch

recipes/backends/sdl/recipe.toml

recipes/backends/sdl2/recipe.toml

recipes/backends/sdl2_image/recipe.toml

recipes/backends/sdl2_mixer/recipe.toml

recipes/backends/sdl2_mixer/redox.patch

recipes/backends/sdl2_ttf/recipe.sh

recipes/backends/sdl_gfx/01_redox.patch

recipes/backends/sdl_gfx/recipe.sh

recipes/backends/sdl_image/01_redox.patch

recipes/backends/sdl_image/recipe.sh

recipes/backends/sdl_mixer/recipe.sh

recipes/backends/sdl_mixer/redox.patch

recipes/backends/sdl_ttf/01_redox.patch

recipes/backends/sdl_ttf/recipe.sh

recipes/backends/webrender/recipe.sh