Use mkdocs snippets to template common content blocks (#135)

manuscript/recipes/nextcloud.md

@@ -2,11 +2,6 @@ hero: Backup all your stuff. Share it. Privately.
 
 # NextCloud
 
-!!! important
-    Ongoing development of this recipe is sponsored by [The Common Observatory](https://www.observe.global/). Thanks guys!
-
-    [![Common Observatory](../images/common_observatory.png)](https://www.observe.global/)
-
 [NextCloud](https://www.nextcloud.org/) (_a [fork of OwnCloud](https://owncloud.org/blog/owncloud-statement-concerning-the-formation-of-nextcloud-by-frank-karlitschek/), led by original developer Frank Karlitschek_) is a suite of client-server software for creating and using file hosting services. It is functionally similar to Dropbox, although Nextcloud is free and open-source, allowing anyone to install and operate it on a private server.
  - https://en.wikipedia.org/wiki/Nextcloud
 
@@ -70,9 +65,7 @@ BACKUP_FREQUENCY=1d
 
 Create a docker swarm config file in docker-compose syntax (v3), something like this:
 
-!!! tip
-        I share (_with my [sponsors](https://github.com/sponsors/funkypenguin)_) a private "_premix_" git repository, which includes necessary docker-compose and env files for all published recipes. This means that sponsors can launch any recipe with just a ```git pull``` and a ```docker stack deploy``` 👍
-
+--8<-- "premix-cta.md"
 
 ```
 version: "3.0"
@@ -224,12 +217,7 @@ location: https://nextcloud.batcave.org/remote.php/dav/
 
 Note that this .htaccess can be overwritten by NextCloud, and you may have to reapply the change in future. I've created an [issue requesting a permanent fix](https://github.com/nextcloud/docker/issues/577).
 
-!!! important
-    Ongoing development of this recipe is sponsored by [The Common Observatory](https://www.observe.global/). Thanks guys!
+[^1]: Since many of my other recipes use PostgreSQL, I'd have preferred to use Postgres over MariaDB, but MariaDB seems to be the [preferred database type](https://github.com/nextcloud/server/issues/5912).
+[^2]: I'm [not the first user](https://github.com/nextcloud/docker/issues/528) to stumble across the service discovery bug with reverse proxies.
 
-    [![Common Observatory](../images/common_observatory.png)](https://www.observe.global/)
-
-## Chef's Notes 📓
-
-1. Since many of my other recipes use PostgreSQL, I'd have preferred to use Postgres over MariaDB, but MariaDB seems to be the [preferred database type](https://github.com/nextcloud/server/issues/5912).
-2. I'm [not the first user](https://github.com/nextcloud/docker/issues/528) to stumble across the service discovery bug with reverse proxies.
+--8<-- "recipe-footer.md"