Convert mobile/android/{docs,fenix/docs,focus-android/docs,docs/
geckoview/{consumer,contributor,design}} RST files to MyST-flavored
Markdown.
- geckoview-architecture.md: rename substitution keys from kebab-case
to snake_case (Jinja parses dashes as subtraction in substitution
expansions).
- geckoview-quick-start.md: drop the unused 'alt text' substitution
frontmatter; the keys had spaces and were never referenced.
- Update :ref: targets to the (firefox-for-android-1)= /
(mozilla-central-setup-1)= / (contribute-with-git)= MyST anchors.
- Refresh allowed-warnings glob for geckoview-architecture from .rst
to .md.
Differential Revision: https://phabricator.services.mozilla.com/D304230
Sylvestre Ledru
2dbef0512a