neovim: rename extraLuaConfig to initLua

Now that the whole lua config is exposed via the extraLuaConfig option,
it's not "extra" anymore but the whole content. Renaming it to "initLua"
is more adequate and it makes the option more understandable I hope.

modules/programs/neovim.nix

@@ -35,6 +35,13 @@ in
 {
   meta.maintainers = with lib.maintainers; [ khaneliman ];
 
+  imports = [
+    (lib.mkRenamedOptionModule
+      [ "programs" "neovim" "extraLuaConfig" ]
+      [ "programs" "neovim" "initLua" ]
+    )
+  ];
+
   options = {
     programs.neovim = {
       enable = mkEnableOption "Neovim";
@@ -211,7 +218,7 @@ in
         '';
       };
 
-      extraLuaConfig = mkOption {
+      initLua = mkOption {
         type = types.lines;
         default = "";
         example = lib.literalExpression ''
@@ -488,7 +495,7 @@ in
       programs.neovim.extraConfig = lib.concatStringsSep "\n" vimPackageInfo.userPluginViml;
       programs.neovim.extraPackages = mkIf cfg.autowrapRuntimeDeps vimPackageInfo.runtimeDeps;
 
-      programs.neovim.extraLuaConfig =
+      programs.neovim.initLua =
         let
           # using default 'foldmarker', to be used with foldmethod=marker
           foldedLuaBlock =
@@ -543,8 +550,8 @@ in
         (map (x: x.runtime) pluginsNormalized)
         ++ [
           {
-            "nvim/init.lua" = mkIf (cfg.extraLuaConfig != "") {
-              text = cfg.extraLuaConfig;
+            "nvim/init.lua" = mkIf (cfg.initLua != "") {
+              text = cfg.initLua;
             };
 
             "nvim/coc-settings.json" = mkIf cfg.coc.enable {