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There is still a lot to tidy up here but wanted to get some opinions sooner rather than later about iFrame layout options
Add a long_description field to villages. This is markdown from untrusted users and is rendered using nh3 and a sandboxed iFrame in order to limit the untrusted HTML.
There are 2 layout options for the iFrame:
The first uses javascript to resize the iFrame to prevent scrolling within the iFrame.
The second uses a static size for the iFrame which scrolls for long content.
The advantage of the second is that we can remove the allow-scripts privilege from the iFrame.
fixes #1816