Merge branch 'master' into ozg-2387

...on/src/lib/header-container/header-container.component.ts

...lient/libs/tech-shared/src/lib/pipe/has-link.pipe.spec.ts

goofy-client/libs/tech-shared/src/lib/tech-shared.module.ts

goofy-client/libs/test-utils/src/lib/helper.ts

...bs/ui/src/lib/ui/slide-toggle/slide-toggle.component.html

...bs/ui/src/lib/ui/slide-toggle/slide-toggle.component.scss

...ui/src/lib/ui/slide-toggle/slide-toggle.component.spec.ts

...libs/ui/src/lib/ui/slide-toggle/slide-toggle.component.ts

goofy-client/libs/ui/src/lib/ui/ui.module.ts

goofy-client/libs/user-settings/src/index.ts

...settings-container/user-settings-container.component.html

...settings-container/user-settings-container.component.scss

...tings-container/user-settings-container.component.spec.ts

...r-settings-container/user-settings-container.component.ts

...r-settings-darkmode/user-settings-darkmode.component.html

...igung/user-settings-email-benachrichtigung.component.html

...ng/user-settings-email-benachrichtigung.component.spec.ts

...container/user-settings-darkmode-container.component.html

...container/user-settings-darkmode-container.component.scss

...tainer/user-settings-darkmode-container.component.spec.ts