Update the meetup-32 information

* Add links about where to find the presentation
* Change the speaker section
I usually prefer a separate section at the end using a heading. That way you can also link directly to that section if you want to reference the presentation in the context of the specific meetup. Something like:

```
#### Presentation

You can enjoy [the presentation](http://xarisd.io/presentations/rails-basics-01) online, and also [explore the source code](https://github.com/xarisd/rails-basics-01).
```