Cleanup of with-yarn example (#7589)

### Description

- remove tsconfig.json from root
- removed an unwanted ",'
- upgraded turbo to 1.12.4

### Testing Instructions

Running `npx create-turbo@latest -e with-yarn` and then `yarn dev`
should work.

Co-authored-by: Anthony Shew <anthony.shew@vercel.com>

examples/with-yarn/README.md

@@ -20,7 +20,7 @@ This Turborepo includes the following packages/apps:
 - `web`: another [Next.js](https://nextjs.org/) app
 - `@repo/ui`: a stub React component library shared by both `web` and `docs` applications
 - `@repo/eslint-config`: `eslint` configurations (includes `eslint-config-next` and `eslint-config-prettier`)
-- `@repo/tsconfig`: `tsconfig.json`s used throughout the monorepo
+- `@repo/typescript-config`: `tsconfig.json`s used throughout the monorepo
 
 Each package/app is 100% [TypeScript](https://www.typescriptlang.org/).
 

examples/with-yarn/package.json

@@ -13,12 +13,11 @@
   },
   "devDependencies": {
     "@repo/eslint-config": "*",
-    "@repo/typescript-config": "*",
     "prettier": "^3.2.5",
     "turbo": "^1.12.4"
   },
   "packageManager": "yarn@1.22.19",
   "engines": {
     "node": ">=18"
   }
-}
+}

examples/with-yarn/packages/typescript-config/react-library.json

@@ -3,6 +3,6 @@
   "display": "React Library",
   "extends": "./base.json",
   "compilerOptions": {
-    "jsx": "react-jsx",
+    "jsx": "react-jsx"
   }
-}
+}