Add markdown linting (without breaking the site this time!)

manuscript/recipes/owntracks.md

@@ -21,7 +21,7 @@ Using a smartphone app, OwnTracks allows you to collect and analyse your own loc
 
 We'll need a directory so store OwnTracks' data , so create  ```/var/data/owntracks```:
 
-```
+```bash
 mkdir /var/data/owntracks
 ```
 
@@ -29,7 +29,7 @@ mkdir /var/data/owntracks
 
 Create owntracks.env, and populate with the following variables
 
-```
+```bash
 OAUTH2_PROXY_CLIENT_ID=
 OAUTH2_PROXY_CLIENT_SECRET=
 OAUTH2_PROXY_COOKIE_SECRET=
@@ -107,4 +107,4 @@ Log into your new instance at https://**YOUR-FQDN**, with user "root" and the pa
 [^2]: I'm using my own image rather than owntracks/recorderd, because of a [potentially swarm-breaking bug](https://github.com/owntracks/recorderd/issues/14) I found in the official container. If this gets resolved (_or if I was mistaken_) I'll update the recipe accordingly.
 [^3]: By default, you'll get a fully accessible, unprotected MQTT broker. This may not be suitable for public exposure, so you'll want to look into securing mosquitto with TLS and ACLs.
 
---8<-- "recipe-footer.md"
+--8<-- "recipe-footer.md"