Updated Installing & updating (markdown)
Update version examples to 0.1.8 / 0.1.8e and Updater example to v0.1.7 -> v0.1.8
v0.1.7 delta: full-release version language (bare 0.1.7, Edge e suffix), release channels + About this release, installer tty/flags note (#75)
Sync to v0.1.7a content
Docs sync: v0.1.5a — Installing & updating
Installing & updating: distro families and v0.1.4a examples
Installing & updating: current version examples to 0.1.3
Docs sync: match the in-app documentation (Builds 1–3 parity)
Created Installing & updating (markdown)