fix(docs): replace undefined video/youtube shortcodes with alternatives

The video and youtube shortcodes are not defined in the documentation
theme, causing Hugo build to fail silently in verbose mode. The build
reports success but no HTML files are generated.

Changes:
- getting-started.md: Replace video shortcode with markdown link
- user-guide.md: Replace video shortcodes with markdown link and
  escaped code examples for youtube/video demonstrations

Standard markdown links provide same functionality without requiring
custom shortcodes. Code examples are properly escaped to show usage
without execution.

Root cause analysis:
- Hugo error: 'template for shortcode "video" not found'
- build.sh in verbose mode doesn't check exit codes
- Results in deployment of source files instead of HTML

This fix resolves the build failure. Recommendations for
build.sh improvements will be provided separately.

Fixes: info-tech-io/info-tech-io.github.io#9
Related: Epic #2, Child #5

Author: Claude-InfoTech

docs/content/getting-started.md

@@ -285,7 +285,8 @@ Reference assets in your content:
 ![Python Logo](../static/images/python-logo.png)
 
 Watch this introduction video:
-{{< video src="../static/videos/intro-python.mp4" >}}
+
+[📹 Introduction to InfoTech CLI](../static/videos/intro-python.mp4)
 ```
 
 ## Validation and Testing

docs/content/user-guide.md

@@ -440,14 +440,14 @@ static/
 #### Video Integration
 
 ```markdown
-# Embed videos in content
-{{< video src="../static/videos/intro.mp4" poster="../static/images/video-poster.jpg" >}}
+# Embed videos in content (as markdown link)
+[📹 Introduction Video](../static/videos/intro.mp4)
 
-# YouTube integration
-{{< youtube id="dQw4w9WgXcQ" title="Tutorial Video" >}}
+# YouTube integration example
+{{</* youtube id="dQw4w9WgXcQ" title="Tutorial Video" */>}}
 
-# Video with transcript
-{{< video src="../static/videos/lesson1.mp4" transcript="../static/transcripts/lesson1.vtt" >}}
+# Video with transcript example
+{{</* video src="../static/videos/lesson1.mp4" transcript="../static/transcripts/lesson1.vtt" */>}}
 ```
 
 ## Workflow Optimization