chore(notebooks): rename generative-modeling -> mixture-of-gaussians (#30)

Mirrors the directory rename in eaia (PR #187) where
aiml-common/lectures/expectation-maximization was renamed to
aiml-common/lectures/mixture-of-gaussians and the chapter overview was
relabeled "Latent Variable Models". The eng-ai-agents internal path now
matches the source path, and the Colab badge URL referenced from
em_example_mog.mdx will resolve correctly under the new directory.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: pantelis

…ture/em-example-mog/em_example_mog.ipynb …ture/em-example-mog/em_example_mog.ipynbnotebooks/generative-modeling/em-gaussian-mixture/em-example-mog/em_example_mog.ipynb renamed to notebooks/mixture-of-gaussians/em-gaussian-mixture/em-example-mog/em_example_mog.ipynb notebooks/generative-modeling/em-gaussian-mixture/em-example-mog/em_example_mog.ipynb renamed to notebooks/mixture-of-gaussians/em-gaussian-mixture/em-example-mog/em_example_mog.ipynb

@@ -386,7 +386,7 @@ notebooks:
   last_executed: 2026-04-13
   duration_seconds: 1.5
 - source: aiml-common/lectures/mixture-of-gaussians/em-gaussian-mixture/em-example-mog/em_example_mog.ipynb
-  notebook: generative-modeling/em-gaussian-mixture/em-example-mog/em_example_mog.ipynb
+  notebook: mixture-of-gaussians/em-gaussian-mixture/em-example-mog/em_example_mog.ipynb
   code_cells: 3
   environment: torch.dev.gpu
   description: EM algorithm on mixture of Gaussians example