Move the NTP guide to the FTLDNS section

The page documents FTL's own NTP client and server rather than a third-party
setup, so it belongs next to the other FTL feature pages instead of under
Guides. The old path redirects to the new one.

Signed-off-by: DL6ER <dl6er@dl6er.de>

mkdocs.yml

@@ -143,6 +143,7 @@ nav:
     - 'Privacy levels': ftldns/privacylevels.md
     - 'dnsmasq warnings': ftldns/dnsmasq_warn.md
     - 'Webserver': ftldns/webserver.md
+    - 'Network Time Protocol': ftldns/ntp.md
     - 'Advanced':
         - 'Install from source': ftldns/compile.md
         - 'Signals': 'ftldns/signals.md'
@@ -201,7 +202,6 @@ nav:
         - 'Performance and other issues': guides/misc/tor/performance-issues.md
         - 'Using DNSSEC': guides/misc/tor/dnssec.md
       - 'Allowlist and Denylist editing': guides/misc/allowlist-denylist.md
-      - 'Network Time Protocol': guides/misc/ntp.md
   - 'Router setup':
     - 'ASUS router': routers/asus.md
     - 'Fritz!Box (EN)': routers/fritzbox.md
@@ -249,6 +249,7 @@ plugins:
         'guides/tor/performance-issues.md': guides/misc/tor/performance-issues.md
         'guides/tor/dnssec.md': guides/misc/tor/dnssec.md
         'guides/whitelist-blacklist.md': guides/misc/allowlist-denylist.md
+        'guides/misc/ntp.md': ftldns/ntp.md
         'ftldns/regex/index.md': regex/index.md
         'ftldns/regex/overview.md': regex/index.md
         'ftldns/regex/tutorial.md': regex/tutorial.md