(docs) tsconfig path alias info

Author: dummdidumm

README.md

@@ -72,6 +72,8 @@ Or remove the script via:
 rm scripts/setupTypeScript.js
 ```
 
+If you want to use `baseUrl` or `path` aliases within your `tsconfig`, you need to set up `@rollup/plugin-alias` to tell Rollup to resolve the aliases. For more info, see [this StackOverflow question](https://stackoverflow.com/questions/63427935/setup-tsconfig-path-in-svelte).
+
 ## Deploying to the web
 
 ### With [Vercel](https://vercel.com)