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

manuscript/recipes/gollum.md

@@ -67,8 +67,8 @@ OAUTH2_PROXY_COOKIE_SECRET=
 
 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'
 
@@ -129,6 +129,6 @@ Launch the Gollum stack by running ```docker stack deploy gollum -c <path-to-doc
 
 Authenticate against your OAuth provider, and then start editing your wiki!
 
-## Chef's Notes 📓
+[^1]: In the current implementation, Gollum is a "single user" tool only. The contents of the wiki are saved as markdown files under /var/data/gollum, and all the git commits are currently "Anonymous"
 
-1. In the current implementation, Gollum is a "single user" tool only. The contents of the wiki are saved as markdown files under /var/data/gollum, and all the git commits are currently "Anonymous"
+--8<-- "recipe-footer.md"