Update Calibre-Web Helm chart metadata and configurations

Updated the Calibre-Web Helm chart's metadata in `Chart.yaml`,
including a more descriptive app description, updated version to
0.1.2, and added keywords, home URL, source references, and
maintainer information.

In `deployment.yaml`, modified the image reference to allow
a customizable image tag instead of defaulting to the app version.

In `values.yaml`, adjusted the size of persistent storage
volumes for `data` and `config`, changing them to 2Gi and
50Mi respectively. This ensures more manageable resource
allocation for deployments, addressing potential over-provisioning.

These changes collectively enhance the usability and
maintainability of the Helm chart for Calibre-Web deployments.

charts/calibre-web/Chart.yaml

@@ -1,21 +1,17 @@
 apiVersion: v2
 name: calibre-web
-description: A Helm chart for Kubernetes
-
-# A chart can be either an 'application' or a 'library' chart.
-#
-# Application charts are a collection of templates that can be packaged into versioned archives
-# to be deployed.
-#
-# Library charts provide useful utilities or functions for the chart developer. They're included as
-# a dependency of application charts to inject those utilities and functions into the rendering
-# pipeline. Library charts do not define any templates and therefore cannot be deployed.
-type: application
-
-# This is the chart version. This version number should be incremented each time you make changes
-# to the chart and its templates, including the app version.
-version: 0.1.1
-
-# This is the version number of the application being deployed. This version number should be
-# incremented each time you make changes to the application.
+description: Calibre-Web is a web app that offers a clean and intuitive interface for browsing, reading, and downloading eBooks using a valid Calibre database.
+version: 0.1.2
 appVersion: 0.6.25-ls360
+keywords:
+  - calibre
+  - ebook
+  - calibre-web
+home: https://git.cooltux.net/marko/HelmChartSammlung/src/branch/main/charts/calibre-web
+sources:
+  - https://github.com/janeczku/calibre-web
+  - https://git.cooltux.net/marko/HelmChartSammlung/src/branch/main/charts/calibre-web
+maintainers:
+  - name: Marko Oldenburg
+    email: development@cooltux.net
+    url: https://git.cooltux.net/marko