initial: zero-trust markdown tutorials site

Single-binary Go service that renders markdown pages from a runtime
volume mount. Targeted at public, no-auth, no-WAF deployment behind a
TLS ingress; security posture is defense-in-depth at every layer:

- goldmark with no WithUnsafe — raw HTML in author markdown is stripped
- CSP without 'unsafe-inline', plus HSTS, COOP, CORP, Permissions-Policy
- static handler rejects non-GET/HEAD, directory listings, dotfiles, traversal
- content loader rejects symlinks that escape the content root, dotfiles,
  and .md files larger than 1 MiB
- per-page template trees (cloned from layout) so define-blocks don't
  collide between home/category/page
- SIGHUP triggers atomic library swap — live edits on volume, no rebuild

Locale layout content/<locale>/<category>/<slug>.md. Categories without
_index.md still appear on the home page with a humanized name. Search is
a ~70-line vanilla JS scan over /search.json?lang=<locale>; swap for a
real indexer if the corpus ever balloons.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

content/en/install-client/_index.md

@@ -0,0 +1,14 @@
+---
+title: Install Minecraft client
+summary: Get a working Minecraft client to connect to our servers.
+order: 1
+---
+
+# Install Minecraft client
+
+Pick the edition that matches what you bought (or want to play offline):
+
+- **Java Edition** — official launcher from Mojang. Required for our Fabric/Paper servers.
+- **Bedrock Edition** — Windows/console/mobile. Currently **not supported** by our servers.
+
+If you don't own Minecraft, see the **offline (cracked) client** guide — you can still play on servers that allow offline mode after registering through Discord.