Geist v0.2.1

Geist v0.2.1.

Supports Ghost 5.0 through 6.73, bundling the editor that ships
with Ghost 6.73.

macOS builds are ad-hoc signed but not notarized yet, so macOS warns
about an unverified developer on first launch. Right-click the app
and choose Open, or run:
xattr -dr com.apple.quarantine /Applications/Geist.app

Windows builds use the WebView2 runtime.

Installed copies update themselves from this release. The updater
manifest is available at:
https://github.com/josiahelstrom/geist/releases/latest/download/latest.json

See docs/releasing.md for the release process.