refactor: move nixos-manual to reference/ + graphifyignore

reference/nixos-manual/release-notes/release-notes.md

@@ -0,0 +1,30 @@
+# Release Notes {#ch-release-notes}
+
+This section lists the release notes for each stable version of NixOS and current unstable revision.
+
+```{=include=} sections
+rl-2511.section.md
+rl-2505.section.md
+rl-2411.section.md
+rl-2405.section.md
+rl-2311.section.md
+rl-2305.section.md
+rl-2211.section.md
+rl-2205.section.md
+rl-2111.section.md
+rl-2105.section.md
+rl-2009.section.md
+rl-2003.section.md
+rl-1909.section.md
+rl-1903.section.md
+rl-1809.section.md
+rl-1803.section.md
+rl-1709.section.md
+rl-1703.section.md
+rl-1609.section.md
+rl-1603.section.md
+rl-1509.section.md
+rl-1412.section.md
+rl-1404.section.md
+rl-1310.section.md
+```