docs: add guide banner image (#651)

Co-authored-by: David Moore <[email protected]>

Author: jyecusch

docs/guides/python/ai-podcast-part-1.mdx

@@ -4,6 +4,8 @@ tags:
   - AI & Machine Learning
 languages:
   - python
+image: /docs/images/guides/ai-podcast/part-1/banner.png
+image_alt: 'AI Podcast Part 1 Banner'
 ---
 
 # Building AI Workflows: Combining LLMs and Voice Models - Part 1