Remove markdown formatting from page title and nav text

Page titles and nav text fields are plain text contexts — backtick
formatting renders literally rather than as code. Titles should not
contain markdown formatting.

Fixes #50

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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

Author: miharp

_data/nav/openvox_8x.yml

@@ -7,7 +7,7 @@
     link: "known_issues.html"
   - text: System requirements
     link: "system_requirements.html"
-  - text: About `openvox-agent`
+  - text: About openvox-agent
     link: "about_agent.html"
 - text: Quick start guides
   items:

docs/_openvox_8x/about_agent.md

@@ -1,6 +1,6 @@
 ---
 layout: default
-title: "About `openvox-agent`"
+title: "About openvox-agent"
 ---
 
 [release_notes]: ./release_notes.html