Code style improvements

Hello! This is Pull Request with various improvements for `Basic Express Site` example.

* remove `node_modules` as we always can download dependencies with `npm`
* added `.gitignore` to not commit dependencies into the repository
* updated dependencies, with `*` version `npm` downloading latest ones that wont work with current code base (it's `jade`)
* updated deprecated `jade` syntax
* added `readme.md`

Regards,
Alex.