Describe and prioritze white spaces on the bike lane layer

[florianlorisch]

• 3. part of story 1

• Define what we consider good and bad bike infrastructure

• Identify polygons that relate to our definition of bad bike infrastructure and highlight them on a map

• Identify densly populated neighbourhoods and points of interest (e.g. commercial areas) among the white spaces and highlight them on the same map

• Make it possible for the user to select a specific area: badly connected residential neighbourhods, badly connected points of interests, all badly connected areas