docs: remove mention of nginx-unit which is officially unmaintained (#4431)

docs: remove mention of nginx-unit which is officially unmaintained, see nginx/unit@76b39e9

Author: euri10

docs/examples/deployment/nginx-unit/install-macos.sh

@@ -10,7 +10,6 @@ Contents
 
 .. toctree::
 
-    nginx-unit
     manually-with-asgi-server
     docker
     supervisor

docs/examples/deployment/nginx-unit/unit.json

@@ -20,8 +20,6 @@ Alternatives
 
 For different deployment scenarios, consider these alternatives:
 
-- :doc:`NGINX Unit <nginx-unit>`:
-    A dynamic web and application server, suitable for running and managing multiple applications.
 - `systemd <https://www.freedesktop.org/wiki/Software/systemd/>`_:
     A system and service manager, integrated into many Linux distributions for managing system processes.
 

docs/topics/deployment/index.rst

@@ -23,8 +23,6 @@ For different deployment scenarios, consider these alternatives:
 
 - :doc:`Docker <docker>`:
     Ideal for containerized environments, offering isolation and scalability.
-- :doc:`NGINX Unit <nginx-unit>`:
-    A dynamic web and application server, suitable for running and managing multiple applications.
 - `systemd <https://www.freedesktop.org/wiki/Software/systemd/>`_:
     A system and service manager, integrated into many Linux distributions for managing system processes.