Issue #3278415 by nod_, lauriii, catch, Wim Leers, longwave, xjm, claudiu.cristea: Remove usages of the JavaScript ES6 build step, the build step itself, and associated dev dependencies

Issue #2897272 by tedbow, Wim Leers, Jo Fitzgerald, Adita, xjm: Fix module description, hook_help(), and document module scope in *.api.php file

Issue #2803375 by cilefen, tedbow, saurabh-chugh, Wim Leers: Rename Outside-in module to "Settings Tray" for real

Issue #2904134 by Wim Leers, tedbow: Settings Tray uses the off-canvas dialog type, but "off_canvas" is not an accurate form plugin name, "settings_tray" is

Issue #2782891 by tedbow, Wim Leers, pk188, tim.plunkett, Adita, RajeevK, xjm, webchick: The Page Title block's title behaves in a confusing way with Settings Tray and the Help block incorrectly has Settings Tray styling