squash migrations, finish single contract view for the most part

contracts/migrations/0001_initial.py

...tions/0002_remove_contract_expected_cost_hour_and_more.py

...rations/0003_rename_subtype_contract_subtypes_and_more.py

...ns/0004_contracttype_remove_contract_subtypes_and_more.py

contracts/migrations/0005_rename_type_contract_types.py

contracts/migrations/0006_remove_contract_contains_nda.py

contracts/models.py

contracts/templates/contracts/index.html

contracts/templates/contracts/view_contract.html