Merge remote-tracking branch 'upstream/main'

This is in the spirit of #16 (thanks for all the help @hugosxm), but I wanted to make sure that it was complete, so that users would be able to deploy the Vikunja Helm Chart easily.

This PR resolves the following:
- Increased documentation around utilizing environment variables from Kubernetes secrets.
- Increased documentation for utilizing a Kubernetes secret as the `config.yml` file instead of a ConfigMap
- Fix the incorrect `mountPath` for the `api` pod.

Co-authored-by: perf3ct <jonfuller2012@gmail.com>
Reviewed-on: vikunja/helm-chart#17
Reviewed-by: konrad <k@knt.li>
Co-authored-by: perfectra1n <perf3ctsec@gmail.com>
Co-committed-by: perfectra1n <perf3ctsec@gmail.com>

Chart.yaml

@@ -10,7 +10,7 @@ description: |-
   the high alpine areas of the Andes and a relative of the llama.
 annotations:
   category: TaskTracker
-version: 0.3.1
+version: 0.4.1
 appVersion: 0.21.0
 kubeVersion: ">= 1.19"
 dependencies: