docs: deprecate repo (#284)

README.md

@@ -1,3 +1,6 @@
+> [!CAUTION]
+> This template is **deprecated**. To get started with an Electron + TypeScript project, we highly recommend starting with [Electron Forge](https://www.electronforge.io/)'s official TypeScript templates.
+
 # electron-quick-start-typescript
 
 **Clone and run for a quick way to see Electron in action.**