Amend some infos in README.md

- update upstream link
- note on postStart
- follow https://sembr.org/ roughly

README.md

@@ -3,20 +3,22 @@
 This helm chart installs Nextcloud and ONLYOFFICE
 and configures Nextcloud to use ONLYOFFICE as its document editor.
 Depends on the
-[Nextcloud](https://github.com/helm/charts/tree/master/stable/nextcloud)
-`@stable` chart. For configuration details on Nextcloud, refer to their
-documentation.
+[Nextcloud](https://github.com/nextcloud/helm/tree/master/charts/nextcloud)
+chart.
+For configuration details on Nextcloud, refer to their documentation.
 
-Parts of this chart are based on a copy of the [COLLABORA code helm
-chart](https://github.com/helm/charts/tree/master/stable/collabora-code)
+Parts of this chart are based on a copy of the 
+[COLLABORA code helm chart](https://github.com/helm/charts/tree/master/stable/collabora-code)
 
 ## Installation
 
 **NOTE:** The `onlyoffice.server_name` variable needs to be
 overwritten with a URL that points to your onlyoffice for this to work
-correctly. See `values-local.yaml.example` for an example of domain
-configurations you might want to do. These instructions assume you copy
-`values-local.yaml.example` to `values-local.yaml` and edit it.
+correctly.
+See `values-local.yaml.example` for an example of domain configurations
+you might want to do.
+These instructions assume you copy `values-local.yaml.example` to `values-local.yaml`
+and edit it.
 
 **NOTE:** It is very important that you uncomment and set the following password and
 secrets variables manually when you run helm install:
@@ -84,21 +86,23 @@ This chart adds a "postStart" command to the Nextcloud pod, that installs apps
 (see below) and applies a custom configuration to set up those apps and
 integration with ONLYOFFICE as well as the Stackspin OIDC provider.
 
-Kubernetes postStart commands do not log to the pod log. Instead, the script
-creates its own log in `/var/www/tmp/postStart<date>.log`. This means that
-even if you can't `exec` into the pod (because something is failing), you can
-see the logs inside the `data` folder in the PVC. Often, if the `postStart`
-command fails, you can also see the problem by running `kubectl describe pod
-<nextcloud pod>`.
+Kubernetes postStart commands do not log to the pod log.
+Instead, the script creates its own log in `/var/www/tmp/postStart<date>.log`.
+This means that even if you can't `exec` into the pod (because something is failing),
+you can see the logs inside the `data` folder in the PVC.
+Often, if the `postStart` command fails,
+you can also see the problem by running `kubectl describe pod <nextcloud pod>`.
 
 ## Apps
 
 The Nextcloud app store allows admin users to install applications, many of
-which have not undergone security testing. For that reason we disabled
-downloading new apps via the app store. As the person installing Nextcloud it is
-possible to specify which applications from the app store are available for
-installation. It is also possible to enable them by default. Apps that are not
-enabled by default can be enabled through the Apps screen in Nextcloud.
+which have not undergone security testing.
+For that reason we disabled downloading new apps via the app store.
+Upon installing Nextcloud it is possible to specify 
+which applications from the app store are available.
+It is also possible to enable them by default.
+Apps that are not enabled by default can be enabled by admins
+through the Apps screen in Nextcloud.
 
 Apps that are installed this way are automatically updated to their newest
 version every time Nextcloud is updated.
@@ -111,10 +115,14 @@ apps:
     enabled: false     # Disables sociallogin by default
 ```
 
-Additionally, we have added an option to install Apps immediately from GitHub
-releases. The benefit of this, compared to installing them with `occ`, is that
-we can pin the versions to specific GitHub releases.  To install an app from
-GitHub releases:
+Note that manually enabled apps will not be disabled upon rerunning the installer,
+which can lead to incompatibility errors upon Nextcloud Server version upgrades.
+Check for `postStart` errors as mentioned above.
+
+Additionally, we have added an option to install Apps immediately from GitHub releases.
+Unlike when installing them with `occ`,
+this allows us to pin the versions to specific GitHub releases.
+To install an app from GitHub releases:
 
 ```yaml
 apps: