treewide: migrate to pluginRC for correct DAG order

The "new" DAG order is as follows:
- (luaConfigPre)
- globalsScript
- basic
- theme
- pluginConfigs
- extraPluginConfigs
- mappings
- (luaConfigPost)

modules/plugins/utility/images/image-nvim/config.nix

@@ -19,7 +19,7 @@ in {
         "magick"
       ];
 
-      luaConfigRC.image-nvim = entryAnywhere ''
+      pluginRC.image-nvim = entryAnywhere ''
         require("image").setup(
           ${toLuaObject cfg.setupOpts}
         )