* docs: draft 0.4.0 release notes
* docs: add Thor store and launcher media for 0.4.0
* docs: show Steam switching to KDE on Thor
* docs: show Castle Crashers touch layouts and controller choices
* docs: add Amazon game install view
* docs: add trimmed user recording of store downloads
* docs: smoother touch controller recording, GOG sign-in and per-game profile screenshots
* docs: clean desktop round-trip recording replaces the KDE gif and file explorer still
* docs: add multi-controller and Steam Controller media, rebuild desktop gif without glitch frames
* docs: add foldable touch gamepad screenshots from its PR
* docs: add the Discord badge to the 0.4.0 notes and tidy contributor lines
* docs: fold fixes to new 0.4.0 features into their entries, add Follow screen shots, point the changelog at the 0.4.0 tag
* docs: add the Add a game dialog to the non-Steam games entry
* docs: add a TL;DR for Mr. Sujano to the 0.4.0 notes
