fix: pull secrets example in values

[Johannes-]

This PR fixes the values.yaml. In the values.yaml the key .Values.imagePullSecrets is included wich is misleading as it is not used.

The helper method uses the values in .global.imagePullSecrets and .Values.images.pullSecrets. Hence I deleted the imagePullSecrets Key and moved it to .Values.images.pullSecrets.

_helperts.tpl
...

{{- define "kubernetes-secret-generator.images.pullSecrets" -}}
  {{- $pullSecrets := list }}

  {{- if .global }}
    {{- range .global.imagePullSecrets -}}
      {{- $pullSecrets = append $pullSecrets . -}}
    {{- end -}}
  {{- end -}}

  {{- range .images -}}
    {{- range .pullSecrets -}}
      {{- $pullSecrets = append $pullSecrets . -}}
    {{- end -}}
  {{- end -}}

  {{- if (not (empty $pullSecrets)) }}
imagePullSecrets:
    {{- range $pullSecrets }}
  - name: {{ . }}
    {{- end }}
  {{- end }}
{{- end -}}

...

[martin-helmich]

Good catch! 👍 Sorry this took a while to review. 🙏