Most of the body generation

* Excludes OFT appendages
Small tool to make sense of the various section names
Put OFT markup sections under an OFT/ path

* So we can identify them and append them all with the right header offset later
Generate the OFT part of the body under ## Phase 1

* Include statutory_deadline and date_of_referral
* add a header_offset of 2 for the OFT sections
Merge pull request #14 from alphagov/body-generation

Body generation