📡 make documentation more LLM friendly (#5244)

Implement the scoped agent-readiness subset for json.nlohmann.me:
- Add the mkdocs-llmstxt plugin to generate llms.txt from the nav
  (full_output/llms-full.txt deliberately omitted to avoid dumping
  500+ API reference pages into one giant file).
- Add a permissive robots.txt with a Sitemap reference.
- Add a build hook (hooks/copy_markdown_source.py) that copies each
  page's Markdown source into the built site as a `<path>.md` sibling
  of its HTML output, so agents/tools can fetch raw Markdown directly.

sitemap.xml was already emitted by default and needed no change.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

docs/mkdocs/docs/robots.txt

@@ -0,0 +1,4 @@
+User-agent: *
+Allow: /
+
+Sitemap: https://json.nlohmann.me/sitemap.xml