Add optimize to list of installed services in NOTES.txt

[Zelldon]

Extend the following:

## Installed Services:

- Zeebe:
  - Docker Image used for Zeebe: {{ .Values.zeebe.image.repository }}:{{ .Values.global.image.tag }}
  - Zeebe Cluster Name: {{ tpl .Values.global.zeebeClusterName . | quote }}
  - Prometheus ServiceMonitor Enabled: {{ .Values.prometheusServiceMonitor.enabled }}
- Operate:
  - Enabled: {{ .Values.operate.enabled }}
  {{- if .Values.operate.enabled }}
  - Docker Image used for Operate: {{ .Values.operate.image.repository }}:{{ .Values.global.image.tag }}
  {{- end }}
- Tasklist:
  - Enabled: {{ .Values.tasklist.enabled }}
  {{- if .Values.tasklist.enabled }}
  - Docker Image used for Tasklist: {{ .Values.tasklist.image.repository }}:{{ .Values.global.image.tag }}
  {{- end }}
- Identity:
  - Enabled: {{ .Values.identity.enabled }}
  {{- if .Values.identity.enabled }}
    {{- if .Values.identity.image.tag }}
  - Docker Image used for Identity: {{ .Values.identity.image.repository }}:{{ .Values.identity.image.tag }}
    {{- else }}
  - Docker Image used for Identity: {{ .Values.identity.image.repository }}:{{ .Values.global.image.tag }}
    {{- end }}
  - Keycloak: {{ .Values.identity.keycloak.image.repository }}:{{ .Values.identity.keycloak.image.tag }}
  {{- end }}
- Elasticsearch:
  - Enabled: {{ .Values.elasticsearch.enabled }}
  - ElasticSearch URL: http://{{ .Values.global.elasticsearch.host }}:{{ .Values.global.elasticsearch.port }}

related to #126