Remove WEBrick and Rack Puppet master pages (removed in Puppet 6)

Delete services_master_rack.markdown and services_master_webrick.markdown,
remove their nav entries, and drop the Classic Rack-based Puppet master
section from services_commands.markdown. Both were deprecated in Puppet 4
and removed in Puppet 6.0.

Signed-off-by: Michael Harp <mike@mikeharp.com>

Author: miharp

_data/nav/openvox_8x.yml

@@ -121,12 +121,6 @@
     link: "services_commands.html"
   - text: Running OpenVox commands on Windows
     link: "services_commands_windows.html"
-  - text: The rack OpenVox server
-    link: "services_master_rack.html"
-  - text: Configuring a Server with Passenger and Apache
-    link: "passenger.html"
-  - text: The WEBrick OpenVox server
-    link: "services_master_webrick.html"
   - text: OpenVox agent on *nix
     link: "services_agent_unix.html"
   - text: OpenVox agent on Windows

docs/_openvox_8x/services_commands.markdown

@@ -11,8 +11,6 @@ title: "Puppet's commands"
 [agent_unix]: ./services_agent_unix.html
 [agent_windows]: ./services_agent_windows.html
 [agent_man]: ./man/agent.html
-[master_rack]: ./services_master_rack.html
-[master_webrick]: ./services_master_webrick.html
 [master_man]: ./man/master.html
 [apply]: ./services_apply.html
 [apply_man]: ./man/apply.html
@@ -69,21 +67,6 @@ For more information, see:
 * [Puppet Server Subcommands][subcommands]
 * [Puppet Master's Man Page][master_man]
 
-### Classic Rack-based Puppet master
-
-Before Puppet Server was released, most users ran a Rack-based Puppet master using the Apache + Passenger stack. This still works, but it's deprecated and will be removed in Puppet 5.
-
-A Rack-based Puppet master compiles and serves configuration catalogs for any number of Puppet agents, using Puppet modules and various other data sources.
-
-It's also possible to run a standalone WEBrick-based Puppet master, but we don't encourage anyone to do this in production.
-
-For more information, see:
-
-* [Overview of Puppet's Architecture][arch]
-* [The Rack Puppet Master][master_rack]
-* [The WEBrick Puppet Master][master_webrick]
-* [Puppet Master's Man Page][master_man]
-
 ### Puppet apply
 
 Puppet apply manages systems without needing to contact a Puppet master server. It compiles its own configuration catalog, using Puppet modules and various other data sources, then immediately applies the catalog.