docs(help-osk): split FAQ into its own page in remote-access section

Move 'Часто задаваемые вопросы' out of the Android/macOS page into
remote-access-faq.md, add it to the 'Удалённый доступ' nav section, and
link it from the hub and homepage.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

help-osk-docs/zensical.toml

@@ -20,6 +20,7 @@ nav = [
     { "Windows 10" = "remote-access-windows.md" },
     { "iOS" = "remote-access-ios.md" },
     { "Android и macOS" = "remote-access-other.md" },
+    { "Часто задаваемые вопросы" = "remote-access-faq.md" },
   ] },
   { "Почта Exchange (Outlook)" = "exchange-outlook.md" },
   { "Почта Exchange (штатное ПО)" = "exchange-native.md" },