Refactor paperless-ai Helm chart for improved configuration

This update substantially refactors the paperless-ai Helm chart.
Key changes include:

- Complete removal of outdated files: `.helmignore`, `LICENSE`,
  `README.adoc`, and several template files like `configfileConfigmap.yaml`,
  `configmap.yaml`, `dataPvc.yaml`, `envfileSecret.yaml`,
  `openAiApiSecret.yaml`, `paperlessApiSecret.yaml`, and others.

- Introduction of a new Persistent Volume Claim configuration in
  `pvc.yaml` to simplify storage management.

- Significant updates to `Chart.yaml` for better metadata, including
  a new maintainer and project description in German.

- Enhancements to the main deployment template in `deployment.yaml`,
  focusing on clarity and proper utilization of Kubernetes security
  contexts, environment variables, and container properties.

- Updated service definitions in `service.yaml` with better labels
  and service properties.

- Refined the `ingress.yaml` to improve external service access
  management, including annotations for potential customization.

These changes were implemented to modernize the Helm chart based on
the current best practices, improve user experience, and set a
foundation for future enhancements. There are no breaking changes to
the existing user configurations.

charts/paperless-ai/templates/ingress.yaml

@@ -1,43 +1,38 @@
-{{- if .Values.ingress.enabled -}}
+# ingress.yaml
+# Definiert einen Kubernetes Ingress, um externen Zugriff auf den Service zu ermöglichen.
+# Standardmäßig ist dieser Ingress deaktiviert und muss in 'values.yaml' aktiviert werden.
+{{- if .Values.ingress.enabled -}} # Dieses Template wird nur gerendert, wenn 'ingress.enabled' true ist.
 apiVersion: networking.k8s.io/v1
 kind: Ingress
 metadata:
-  name: {{ include "paperless-ai.fullname" . }}
+  name: {{ include "paperless-ai.fullname" . }} # Der Name des Ingress.
   labels:
-    {{- include "paperless-ai.labels" . | nindent 4 }}
+    {{- include "paperless-ai.labels" . | nindent 4 }} # Allgemeine Labels für den Ingress.
   {{- with .Values.ingress.annotations }}
   annotations:
-    {{- toYaml . | nindent 4 }}
+    {{- toYaml . | nindent 4 }} # Zusätzliche Anmerkungen für den Ingress (z.B. für Cert-Manager oder Nginx-Controller).
   {{- end }}
 spec:
-  {{- with .Values.ingress.className }}
-  ingressClassName: {{ . }}
+  {{- if .Values.ingress.className }}
+  ingressClassName: {{ .Values.ingress.className }} # Der Name der Ingress-Klasse.
   {{- end }}
   {{- if .Values.ingress.tls }}
   tls:
-    {{- range .Values.ingress.tls }}
-    - hosts:
-        {{- range .hosts }}
-        - {{ . | quote }}
-        {{- end }}
-      secretName: {{ .secretName }}
-    {{- end }}
+    {{- toYaml .Values.ingress.tls | nindent 4 }} # TLS-Konfiguration für HTTPS.
   {{- end }}
   rules:
     {{- range .Values.ingress.hosts }}
-    - host: {{ .host | quote }}
+    - host: {{ .host | quote }} # Der Hostname für den Ingress.
       http:
         paths:
           {{- range .paths }}
-          - path: {{ .path }}
-            {{- with .pathType }}
-            pathType: {{ . }}
-            {{- end }}
+          - path: {{ .path }} # Der Pfad, der weitergeleitet werden soll.
+            pathType: {{ .pathType }} # Der Typ des Pfades (Prefix, Exact, ImplementationSpecific).
             backend:
               service:
-                name: {{ include "paperless-ai.fullname" $ }}
+                name: {{ include "paperless-ai.fullname" $ }} # Name des Services, an den weitergeleitet wird.
                 port:
-                  number: {{ $.Values.service.port }}
+                  number: {{ $.Values.service.port }} # Port des Services.
           {{- end }}
     {{- end }}
 {{- end }}