What issue(s) is this trying to resolve?

• fix(sltt-app): debug, simplify, document Mac app build/release process fix(sltt-app): debug, simplify, document Mac app build/release process #55

What particularly has changed?

• Added "Publish release to Github (Mac)" section to README.md
• Added new script entries to package.json to support this process
• Debugged auto update configuration

Steps for testing

1. Manually download and install on Mac: https://github.com/ubsicap/sltt-app/releases/download/v206315.4.4/sltt-app-206315.4.4.dmg
2. This should display version 2.63.15 in app-client
3. After a few minutes restart app. Shoud cause auto update to 2.65.12.

ticket: #55
commit-convention: https://www.conventionalcommits.org/en/v1.0.0/