fix(css): oops, flat ToC rendering

Adjusted a few ToC and navigation settings to fix flat rendering.
Also removed `toc.integrate`
Fixed margin-left
Altered changelog admonition types
Fixed admonition title rendering bug (overlap)

Signed-off-by: nopeitsnothing <no@anonymousplanet.net>

docs/pgp/index.md

@@ -2,7 +2,7 @@
 title: "PGP"
 description: "Import our GPG keys to verify our releases and signed content."
 hide:
-  - toc
+  - navigation
 schema:
   "@context": https://schema.org
   "@type": Organization