Update paperless-ngx chart version to 0.25.0

Changed the chart version from 0.25.4 to 0.25.0 in Chart.yaml and
README.md to reflect the correct release version. This ensures that
users are aware of the currently deployed version of the application.

Additionally, updated the configuration in values.yaml by adding
the `spec` section under the `readiness` and `liveness` probes.
This clarifies the configuration structure and ensures compatibility
with the latest Helm chart practices.

No breaking changes were introduced in this update.

charts/paperless-ngx/README.md

@@ -2,7 +2,7 @@
 
 <img src="https://raw.githubusercontent.com/paperless-ngx/paperless-ngx/b948750/src-ui/src/assets/logo-notext.svg" align="right" width="92" alt="paperless-ngx logo">
 
-![Version: 0.25.4](https://img.shields.io/badge/Version-0.25.4-informational?style=flat)
+![Version: 0.25.0](https://img.shields.io/badge/Version-0.25.0-informational?style=flat)
 ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat)
 ![AppVersion: 2.20.0](https://img.shields.io/badge/AppVersion-2.20.0-informational?style=flat)