Additional language markers

_posts/2022-11-21-gotosocial-on-fly-io.md

@@ -27,7 +27,7 @@ Let's deploy it on [fly.io].
 We start by creating a new Fly app.
 We stick to a generated name and put it into Frankfurt.
 
-```bash
+```shell
 $ mkdir -p Documents/gotosocial-fly
 $ cd Documents/gotosocial-fly
 $ fly launch

_posts/2023-07-24-old-ruby-on-modern-nix.md

@@ -81,7 +81,7 @@ I trimmed that down just slightly and swapped in Ruby 2.7 (here's the [list of a
 
 The important line is this:
 
-```
+```nix
 ruby = pkgs."ruby-2.7.8";
 ```
 
@@ -89,7 +89,7 @@ ruby = pkgs."ruby-2.7.8";
 
 Now on to installing it into a shell:
 
-```
+```bash
 nix develop
 ```