Remove scripts/fix-llms-paths.js once docusaurus-plugin-llms handles slug + id-collapse paths

[katomm]

Context

In #1787 we added docusaurus-plugin-llms to generate llms.txt + per-page
.md siblings. The plugin (v0.4.0) generates .md files at paths derived
from the source file location and slug: frontmatter, but it doesn't
account for two Docusaurus URL-rewriting behaviors used in this repo:

1. slug: frontmatter — page URL is decoupled from source path.
   Example: docs/learn/core-concepts/overview.md with slug: /learn/core-concepts/
   renders at /docs/learn/core-concepts/, but the plugin writes the .md to
   build/learn/core-concepts.md. Appending .md to the page URL → 404.

2. Filename equals parent directory name — Docusaurus collapses the URL.
   Example: docs/governance/cardano-governance/cardano-governance.md renders at
   /docs/governance/cardano-governance/, but the plugin writes the .md to
   build/docs/governance/cardano-governance/cardano-governance.md.
   Appending .md to the page URL → 404.

Affects 13 pages on this site.

Workaround in place

scripts/fix-llms-paths.js runs in package.json's build step after
docusaurus build. It moves the 13 misplaced .md files to their URL-aligned
paths and rewrites the URLs inside llms.txt / llms-full.txt.

Upstream status

Related issues against rachfop/docusaurus-plugin-llms:

• Open rachfop/docusaurus-plugin-llms#41 — .md paths are invalid and return Not Found (v0.4.0)
• Open rachfop/docusaurus-plugin-llms#43 — URLs silently drop baseUrl and break when docsDir has a trailing slash (v0.4.0)
• Closed rachfop/docusaurus-plugin-llms#4 — Wrong URL - The plugin ignores slug (claimed fixed but regressed)
• Closed rachfop/docusaurus-plugin-llms#15 — Incorrect generated URLs: Docusaurus path prefix in slug is not removed
• Closed rachfop/docusaurus-plugin-llms#20 — Preserve original URL paths for markdown files instead of flattening them

Downgrading to v0.3.1 or v0.2.2 makes things worse (verified — v0.3.1 introduces
a double-slash baseUrl bug, v0.2.2 strips /docs/ from all 335 pages).

Action when fixed

When upstream lands a fix that respects routeBasePath, slug:, and the
id-collapse pattern:

1. Bump docusaurus-plugin-llms in package.json.
2. Run yarn build and verify all 13 URLs in scripts/fix-llms-paths.js
   return 200 with .md siblings at the URL-aligned location.
3. Delete scripts/fix-llms-paths.js.
4. Remove the && node scripts/fix-llms-paths.js tail from the build script
   in package.json.
5. Close this issue.