update values.yaml to modify configuration for vault based on helm values

General MR

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Relates #60 (closed)

chart/CHANGELOG.md

 ## Unreleased
 
+## 0.25.1 (December 29, 2023)
+Changes:
+* Updated `values.yaml` to configure Vault TLS configuration based on `global.tlsDiable`, `istio.vault.tls.key`, and `istio.vault.tls.cert`
+* Updated Developer Documentation to provide guidance for configuring Vault with a `PASSTHROUGH` istio gateway
+
 ## 0.25.0 (June 26, 2023)
 
 Changes: