v2.3.0
doc: clarify wording of files.*.verification.hash
doc/configuration-*: update for new spec
doc/development: update spec stabilization instructions
Add SHA-256 reference in the docs
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
Additional detail around Adobe production use case
doc: detail Ignition's design and the rationale behind it
docs: minor fixes to platforms page