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

highlights/duskfox.lua

@@ -0,0 +1,3 @@
+return { -- a table of overrides/changes to the duskfox theme
+  Normal = { bg = "#000000" },
+}

highlights/init.lua

@@ -0,0 +1,3 @@
+return { -- this table overrides highlights in all themes
+  -- Normal = { bg = "#000000" },
+}