docs: improve readmes and add example

charts/immich/example/immich-values.yaml

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+common:
+  config:
+    vectorExtension: pgvector
+  postgres:
+    host: immich-db-rw
+    existingSecret:
+      enabled: true
+      secretName: immich-db-immich
+      usernameKey: username
+      passwordKey: password
+  redis:
+    host: immich-redis-master
+    existingSecret:
+      enabled: true
+      secretName: immich-redis-access
+      passwordKey: password
+server:
+  volumeMounts:
+    - mountPath: /usr/src/app/upload
+      name: uploads
+  volumes:
+    - name: uploads
+      hostPath:
+        path: /data/media/immich
+        type: Directory
+machineLearning:
+  enabled: true

charts/immich/example/postgres.yaml

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+apiVersion: v1
+kind: Secret
+metadata:
+  name: immich-db-immich
+type: Opaque
+stringData:
+  username: "an-user"
+  password: "a-password"
+---
+apiVersion: postgresql.cnpg.io/v1
+kind: Cluster
+metadata:
+  name: immich-db
+spec:
+  imageName: ghcr.io/cloudnative-pg/postgresql:17.2-bookworm
+  instances: 1
+  storage:
+    size: 15Gi
+  bootstrap:
+    initdb:
+      database: immich
+      owner: immich
+      secret:
+        name: immich-db-immich
+  managed:
+    roles:
+      - name: immich
+        createdb: true
+        login: true
+        superuser: true
+        passwordSecret:
+          name: immich-db-immich

charts/immich/example/redis-secret.yaml

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+apiVersion: v1
+kind: Secret
+metadata:
+  name: immich-redis-access
+type: Opaque
+stringData:
+  password: "a-password"

charts/immich/example/redis-values.yaml

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+architecture: standalone
+auth:
+  enabled: true
+  existingSecret: immich-redis-access
+  existingSecretPasswordKey: password