Use emptyDir if no PVC should be created

Closes #267

See merge request !196

Install Theodolite volumes using Helm

Closes #114

See merge request !192

Add new SLO checker for the metric of skipped/dropped-records

Closes #250

See merge request !185

update helm charts

Closes #251 and #260

See merge request !194

Merge branch 'master' of git.se.informatik.uni-kiel.de:she/theodolite into 250-add-dropped-records-slo-correct-branch

Update Docs for Release 0.5.0

See merge request !191

Update demant-metric notebooks in order to run with the new implementation

Closes #254

See merge request !190