refactor(cli.rs): change template config CSP to null, closes #3427 (#3429)

.changes/template-csp-null.md

@@ -0,0 +1,5 @@
+---
+"cli.rs": patch
+---
+
+Change the `init` template configuration to disable CSP for better usability for new users.

tooling/cli/templates/app/src-tauri/tauri.conf.json

@@ -62,7 +62,7 @@
       }
     ],
     "security": {
-      "csp": "default-src 'self'"
+      "csp": null
     }
   }
 }