OCDS 1.2 redirects

* guidance/build/easy_releases/ -> change_history_options
* guidance/map/contract_suspension/ -> guidance/map/#deal-with-the-hard-cases
* schema/record_package/ -> schema/packaging/record_package/
* schema/release_package/ -> schema/packaging/release_package/

Blocked as OCDS 1.2 not released.