[doc] Rewrite most frontmatters to Markdown titles
Completely throw away the frontmatter and only keep the title which is
turned into a Markdown title.
To recreate the rewrite, run the added script,
`util/rewrite_frontmatter.py`, in the root of the repo.
```sh
python3 util/rewrite_frontmatter.py ./
```
Signed-off-by: Hugo McNally <hugo.mcnally@gmail.com>
Co-authored-by: Amaury Pouly <amaury.pouly@lowrisc.org>
diff --git a/sw/device/lib/dif/dif_aon_timer.md b/sw/device/lib/dif/dif_aon_timer.md
index ad368e4..f1331c8 100644
--- a/sw/device/lib/dif/dif_aon_timer.md
+++ b/sw/device/lib/dif/dif_aon_timer.md
@@ -1,6 +1,4 @@
----
-title: "Always-On Timer DIF Checklist"
----
+# Always-On Timer DIF Checklist
This checklist is for [Development Stage](../../../../doc/project_governance/development_stages.md) transitions for the [Always-On Timer DIF](../../../../hw/ip/aon_timer/README.md).
All checklist items refer to the content in the [Checklist](../../../../doc/project_governance/checklist/README.md).
