feat(documentation): Kavita documentation and config tweaks for generic use

Kavita/README.md

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+# Kavita
+Kavita is a service for managing your ebooks. Think of it like a JellyFin for ebooks and manga. One drawback is that it doesn't have a feature for uploading ebooks
+
+## Using this kubernetes config
+In `deployment.yml`, you will need to set the host path for the kavita config folder (this is because sqlite can have issues with file locking on non-host filesystems (e.g. a network share or a container volume), so it needs to be on the host's filesystem)
+
+In `ingress.yml`, set the hostname that users will use to connect to the service. This config assumes you have cert-manager installed on your cluster, so if you want to provide HTTPS another way, feel free to comment out the `spec.tls` section (the annotation shouldn't affect anything, but you can comment it out as well if you want)
+
+## Customisations
+If you would like the ebook folder to be a mounted folder from the host's filesystem, inside of `deployment.yml` replace this section:
+``` yaml
+- name: kavita-data
+  persistentVolumeClaim:
+    claimName: kavita-data
+    readOnly: true
+```
+with the following:
+``` yaml
+- name: kavita-data
+  hostPath:
+    path: <path on host machine>
+```
+and remove the `kavita-data` persistent volume claim config