Update for leanpub preview

manuscript/ha-docker-swarm/nodes.md

@@ -2,12 +2,10 @@
 
 Let's start building our cluster. You can use either bare-metal machines or virtual machines - the configuration would be the same. To avoid confusion, I'll be referring to these as "nodes" from now on.
 
-!!! note
     In 2017, I **initially** chose the "[Atomic](https://www.projectatomic.io/)" CentOS/Fedora image for the swarm hosts, but later found its outdated version of Docker to be problematic with advanced features like GPU transcoding (in [Plex](https://geek-cookbook.funkypenguin.co.nz/recipes/plex/)), [Swarmprom](https://geek-cookbook.funkypenguin.co.nz/recipes/swarmprom/), etc. In the end, I went mainstream and simply preferred a modern Ubuntu installation.
 
 ## Ingredients
 
-!!! summary "Ingredients"
     New in this recipe:
 
     * [ ] 3 x nodes (*bare-metal or VMs*), each with:
@@ -67,7 +65,6 @@ ln -sf /usr/share/zoneinfo/<your timezone> /etc/localtime
 
 After completing the above, you should have:
 
-!!! summary "Summary"
     Deployed in this recipe:
     
     * [X] 3 x nodes (*bare-metal or VMs*), each with: