Update a few bits of Nextcloud (per Nextcloud GmbH's request)

nextcloud/README-short.txt

@@ -1 +1 @@
-A safe home for all your data
+Nextcloud manual docker image

nextcloud/content.md

@@ -4,8 +4,6 @@ A safe home for all your data. Access & share your files, calendars, contacts, m
 
 > [Nextcloud.com](https://nextcloud.com/)
 
-%%LOGO%%
-
 This Docker micro-service image is developed and maintained by the Nextcloud community. Nextcloud GmbH does not offer support for this Docker image. When you are looking to get professional support, you can become an [enterprise](https://nextcloud.com/enterprise/) customer or use [AIO](https://github.com/nextcloud/all-in-one#nextcloud-all-in-one).
 
 # How to use this image

nextcloud/deprecated.md

@@ -0,0 +1,3 @@
+# IMPORTANT NOTE
+
+⚠ This image is not officially supported by Nextcloud GmbH, use at your own risk. Use the [All-in-One docker image](https://github.com/nextcloud/all-in-one#nextcloud-all-in-one) for easier deployment.

nextcloud/maintainer.md

@@ -1 +1 @@
-[Nextcloud](%%GITHUB-REPO%%)
+[the Nextcloud community](%%GITHUB-REPO%%)