docs: Add missing client settings pages to navigation (#688)

Add all 5 system tray settings under Client > Settings: Allow SSH,
Block Inbound Connections, Connect on Startup, Enable Lazy Connections,
and Enable Quantum-Resistance. Allow SSH and Enable Lazy Connections
redirect to existing docs. Connect on Startup is a new page. Renames
Post-Quantum Cryptography heading to Enable Quantum-Resistance to match
the GUI label.

next.config.mjs

@@ -505,6 +505,16 @@ const nextConfig = {
                 permanent: true,
             },
             // documentation redirects for client
+            {
+                source: '/client/allow-ssh',
+                destination: '/manage/peers/ssh#enabling-ssh',
+                permanent: true,
+            },
+            {
+                source: '/client/enable-lazy-connections',
+                destination: '/manage/peers/lazy-connection',
+                permanent: true,
+            },
             {
                 source: '/how-to/profiles',
                 destination: '/client/profiles',