dev format-docs: Prevent prettier from automatically formatting code blocks

We have our own code for formatting JSON and cf3.

I was seeing an issue where JSON code blocks were getting reformatted
even if I marked them as skip / noautoformat. Prettier would "get in
the way" by reformatting the JSON code blocks.

Signed-off-by: Ole Herman Schumacher Elgesem <ole.elgesem@northern.tech>

Author: olehermanse

src/cfengine_cli/docs.py

@@ -349,7 +349,7 @@ def _run_prettier(path):
         # Wrong: prettier --write **.markdown **.md
         # Right: prettier --write '**.markdown' '**.md'
         subprocess.run(
-            ["prettier", "--write", *args],
+            ["prettier", "--embedded-language-formatting", "off", "--write", *args],
             capture_output=True,
             text=True,
             check=True,