Bug fix on with rollup (#7651)
### Description
- fix `Parsing error: The keyword 'const' is reserved` in eslint-config
package by excluding `apps/**` and `packages/**` from the root
.eslintrc.js
- include next.config.js in tsconfig.json to fix the error `ESLint was
configured to run on next.config.js .However, that TSConfig does not
include this file.`
- set eslint to ignore .eslintrc.js in packages/ui (it was missed to
ignore because it ends in .cjs not .js )
- add external packages in rollup to fix:
```
(!) Unresolved dependencies
https://rollupjs.org/troubleshooting/#warning-treating-module-as-external-dependency
react/jsx-runtime (imported by "Header.tsx")
```
- update README
### Testing Instructions
Running `npx create-turbo@latest -e with-rollup` and then `pnpm dev`
should work fine.
---------
Co-authored-by: Anthony Shew <anthony.shew@vercel.com>
