Replace 'Puppet master' with 'OpenVox Server' across 8x docs

[miharp]

Summary

Many pages in the 8x docset still use "Puppet master" and "Puppet agent" (old product names) where "OpenVox Server" and "OpenVox agent" are the correct terms. This is a broad rename pass across the collection — ~360 occurrences across 62 files.

Rules

Replace in prose

• "Puppet master" as a product/role name → "OpenVox Server"
• "Puppet agent" as a product/role name → "OpenVox agent"
• [master] config section in prose → [server] (deprecated in favor of [server] per openvox source, which emits a deprecation warning; note backward compat where appropriate)
• --section master in prose → --section server

Keep as-is (technically correct setting/parameter names)

• Setting names: masterport, jruby-puppet.master-conf-dir, master-run-dir, and similar master-prefixed config key names
• master.example.com hostname examples (can update to server.example.com at discretion but not required)
• `puppet agent` and `puppet master` in code spans (these are CLI command names)

Remove

• Rack/Passenger master references (passenger.markdown is a candidate for deletion entirely)
• Puppet Enterprise-specific content that has no OpenVox equivalent