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/dashboard/dashboard-nvim/config.nix

@@ -13,7 +13,7 @@ in {
       "dashboard-nvim"
     ];
 
-    vim.luaConfigRC.dashboard-nvim = entryAnywhere ''
+    vim.pluginRC.dashboard-nvim = entryAnywhere ''
       require("dashboard").setup{}
     '';
   };