desktop: Add flavours program to set colors

Switching from my custom, brittle, styling implementation `styler` to
the wonder `flavours` program which does exactly the same only with more
clarity, faster and - I would presume - more stable.

desktop/.config/flavours/config.toml

@@ -0,0 +1,84 @@
+# Configuration for flavours
+# https://github.com/Misterio77/flavours
+#
+# This file should contain a [[items]] section for each application you want themed
+# You can also set a shell (outside items) on which to run hooks
+# Check flavours repository for more information and examples
+
+
+# Explanation and default values for keys:
+
+# # Through which shell command hooks will run. The command will be replaced in '{}'
+shell = "bash -c '{}'"
+#
+# [[items]]
+# # File to inject to, supports tilde and env var expansion. required
+# file = "~/.config/example"
+# # Template to use. required
+# template = "example"
+#
+# # Subtemplate to use
+# subtemplate = "default"
+# # If not rewriting, on which line (usually a comment) to start replacing
+# start = "# Start flavours"
+# # If not rewriting, on which line (usually a comment) to stop replacing
+# end = "# End flavours"
+# # Should we rewrite the entire file, instead of using the above delimiters?
+# rewrite = false
+# # Command to execute after injecting (goes through shell)
+# hook = ""
+# # Whether this hook should be executed when flavours is ran with lightweight flag
+# light = true
+
+[[items]]
+template = "waybar"
+file = "~/.local/state/waybar/colorscheme.css"
+rewrite = true
+light = false
+hook = "killall -SIGUSR2 waybar"
+
+[[items]]
+# Uses custom nvim template to work together with
+# RRethy base16 neovim plugin
+template = "nvim"
+file = "~/.local/state/nvim/colorscheme.lua"
+rewrite = true
+
+[[items]]
+# For newer wezterm versions (missing cursor= field)
+# make use of my custom wezterm template
+template = "wezterm"
+file = "~/.local/state/wezterm/colors.toml"
+rewrite = true
+
+[[items]]
+template = "zathura"
+file = "~/.local/state/zathura/zathurarc"
+rewrite = true
+
+[[items]]
+template = "qutebrowser"
+subtemplate = "minimal"
+file = "~/.local/state/qutebrowser/colorscheme.py"
+rewrite = true
+light = false
+hook = "pgrep -x qutebrowser && qutebrowser :config-source"
+
+# CSS Webpage styling in qutebrowser
+[[item]]
+file = "~/.config/qutebrowser/stylesheets/stylesheet.css"
+template = "styles"
+subtemplate = "css-variables"
+rewrite = false
+start = "/* Start flavours */"
+end = "/* End flavours */"
+
+[[items]]
+# MAKO DOES NOT SUPPORT INCLUDES YET
+template = "mako"
+file = "~/.config/mako/config"
+light = false
+rewrite = false
+start = "# Start flavours"
+end = "# End flavours"
+hook = "killall mako"