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/templates/nvim/templates/default.mustache

@@ -0,0 +1,29 @@
+-- base16-nvim (https://github.com/wincent/base16-nvim)
+-- by Greg Hurrell (https://github.com/wincent)
+-- based on
+-- base16-vim (https://github.com/chriskempson/base16-vim)
+-- by Chris Kempson (https://github.com/chriskempson)
+-- using nvim-base16 neovim plugin
+-- by RRethy (https://github.com/RRethy/nvim-base16)
+-- {{scheme-name}} scheme by {{scheme-author}}
+
+require('base16-colorscheme').setup({
+    base00 = '#{{base00-hex}}',
+    base01 = '#{{base01-hex}}',
+    base02 = '#{{base02-hex}}',
+    base03 = '#{{base03-hex}}',
+    base04 = '#{{base04-hex}}',
+    base05 = '#{{base05-hex}}',
+    base06 = '#{{base06-hex}}',
+    base07 = '#{{base07-hex}}',
+    base08 = '#{{base08-hex}}',
+    base09 = '#{{base09-hex}}',
+    base0A = '#{{base0A-hex}}',
+    base0B = '#{{base0B-hex}}',
+    base0C = '#{{base0C-hex}}',
+    base0D = '#{{base0D-hex}}',
+    base0E = '#{{base0E-hex}}',
+    base0F = '#{{base0F-hex}}'
+})
+
+-- vim: filetype=lua