Fix broken image URL and add missing .cpu() in code snippets

Remove zero-shot segmentation snippet, link to GitHub for advanced use cases

PCA visualization: add whitening and sigmoid

Add navigation table linking all variants and DPT heads

Switch to bus image with matching classes

Improve code examples: better classes, descriptive comments

Use cat photo, add print statements to code examples

Fix zero-shot segmentation section, use public example image

Update README

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