apache2ctl: add page (#2073)

pages/linux/apache2ctl.md

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+# apache2ctl
+
+> The CLI tool to administrate HTTP web server Apache.
+> This commmand comes with Debian based OSes, for RHEL based ones see `httpd`.
+
+- Start the Apache daemon. Throw a message if it is already running:
+
+`sudo apache2ctl start`
+
+- Stop the Apache daemon:
+
+`sudo apache2ctl stop`
+
+- Restart the Apache daemon:
+
+`sudo apache2ctl restart`
+
+- Test syntax of the configuration file:
+
+`sudo apache2ctl -t`
+
+- List loaded modules:
+
+`sudo apache2ctl -M`