feat: initial push with a fully separated and organized user configuration for AstroNvim v3

heirline/colors.lua

@@ -0,0 +1,5 @@
+-- Customize colors for each element each element has a `_fg` and a `_bg`
+return function(colors)
+  colors.git_branch_fg = astronvim.get_hlgroup "Conditional"
+  return colors
+end