happa release v1.31.1

Nov 15, 2021 Developer Portal happa v1.31.1

Changes

Getting started: remove outdated text, apply sentence case by @marians in https://github.com/giantswarm/happa/pull/2915
Fix node pool creation: spot instances should be disabled by default by @kuosandys in https://github.com/giantswarm/happa/pull/2933

Full Changelog: https://github.com/giantswarm/happa/compare/v1.31.0...v1.31.1