v2.5.0
doc/configuration-*: clarify references to `source`
doc: add LUKS fields to configuration document
doc/development: update spec stabilization instructions
doc: update link for systemd drop-ins
doc/getting-started: rm online validator section
doc/migrating-configs: update for 3.1.0
Allow to specify HTTP headers for fetching configs and files
doc: detail Ignition's design and the rationale behind it
doc: add Azure Stack to platform list