[CAPE] Integration with WhatDoTheyKnow

[RichardTaylor]

1. Using the API at

https://www.whatdotheyknow.com/help/api

present a link on pages such as

https://data.climateemergency.uk/councils/cambridge-city-council/

encouraging the use of WhatDoTheyKnow to make requests relating to the material presented eg. drilling down on information proactively released in, climate documents.

2. Present links to requests to the council in question on WhatDoTheyKnow which are either tagged "climate" or include relevant keywords.

Related issue on WhatDoTheyKnow:

mysociety/whatdotheyknow-theme#919