Regenerate website spec

[brandonchinn178]

Noticed the website is a bit outdated with the spec. Regenerated with the following steps:

1. Make the following edit to draft-marchan-kdl2.md:

@@ -39,14 +39,9 @@ language, and a data exchange or storage format, if you so choose.
 This is the formal specification for KDL, including the intended data model and
 the grammar.
 
-This document describes an unreleased minor change to KDL. For the latest
-official version of the language, see https://kdl.dev/spec.
-
-<!--
 This document describes KDL version KDL 2.0.0. It was released on 2024-12-21. It
 is the latest stable version of the language, and will only be edited for minor
 copyedits or major errata.
--->
 
 --- note_License

2. Run make

It looks like the upstream repo also updated styles and libraries, so the new website also looks a bit different.