Merge branch 'development' of https://gitlab.metager.de/open-source/MetaGer into development

Dockerfile

app/CacheHelper.php

app/Console/Commands/CacheGC.php

app/Console/Commands/RequestCacher.php

app/Console/Commands/RequestFetcher.php

app/Console/Commands/WorkerSpawner.php

app/Console/Kernel.php

app/Http/Controllers/MetaGerSearch.php

app/Http/Middleware/HumanVerification.php

app/Jobs/Searcher.php

app/MetaGer.php

app/Models/Quicktips/Quicktips.php

app/Models/Searchengine.php

chart/templates/deployment.yaml

chart/values.yaml

index.html

public/img/apple/touch-icon-114.png

public/img/apple/touch-icon-120.png

public/img/apple/touch-icon-144.png

public/img/apple/touch-icon-152.png