OZG-643 scrolling via keyboard

goofy-client/apps/goofy/src/app/app.component.html

goofy-client/apps/goofy/src/app/app.component.scss

goofy-client/apps/goofy/src/app/app.component.ts

goofy-client/apps/goofy/src/styles/layout/_main.scss

...s/navigation/src/lib/build-info/build-info.component.scss

...ion/src/lib/header-container/header/header.component.scss

...s/navigation/src/lib/navigation/navigation.component.scss

...page-container/postfach-page/postfach-page.component.html

.../ui/src/lib/ui/subnavigation/subnavigation.component.scss

...ge/vorgang-detail-area/vorgang-detail-area.component.scss

...ib/vorgang-detail-page/vorgang-detail-page.component.html

...rc/lib/vorgang-list-page/vorgang-list-page.component.html

...iner/wiedervorlage-page/wiedervorlage-page.component.html