Give every code block a type to fix rendering issue

Dockerfile

@@ -6,3 +6,4 @@ RUN apt-get update && apt-get install -y python3-pygments
 RUN luarocks install sitegen
 
 CMD ["sh", "-c", "openresty -p `pwd` -g 'daemon off;'"]
+# CMD ["openresty", "-p", "/opt/app", "-g", "daemon off;"]

docs/2023-08-03-recursively-list-all-files-in-a-directory-with-elixir.md

@@ -8,7 +8,7 @@ We wish to print a list of all the files in a directory, ignoring files beginnin
 
 Finds all files in the `path` directory recursively, ignoring any files or directories that start with any of the characters in the `@starts_with` module attribute.
 
-```
+```elixir
 defmodule Files do
   @starts_with [".", "_"]
 
@@ -39,7 +39,7 @@ end
 
 The data structure holding the results of the file search.
 
-```
+```iex
 iex(1)> directory_tree = Files.find("hello")
 {"hello",
  [
@@ -77,7 +77,7 @@ iex(1)> directory_tree = Files.find("hello")
 
 Sort alphabetically, with directories last. Downcase before comparing strings.
 
-```
+```elixir
 defmodule Paths do
   def puts(dir_tree), do: dir_tree |> print() |> Enum.join("\n") |> IO.puts()
 
@@ -103,7 +103,7 @@ end
 
 Print all the files sorted.
 
-```
+```iex
 iex(2)> Paths.puts(directory_tree)
 hello/mix.exs
 hello/README.md