Style the workshop event page

[Malwine]

The single event page should be styled like the old one 😄
⚠️ we need to figure out if there is a gem or library for the map.

[Malwine]

This issue includes the map. @yokolet has found a gem that we can use. ✅

[Malwine]

Map:

get coordinates from adress

gem 'geocoder'

https://github.com/alexreisner/geocoder

Here is some haml code how we use it at rorganize.it

.col-md-4
      #group-map
        - if @group.address?
          #map{data: {latitude: @group.latitude, longitude: @group.longitude}}
        - else
          = image_tag('follow_your_dreams.gif')