docs(blog): condense duplicate closing paragraph

[konjoinfinity]

Summary

• Deleted the trailing paragraph "Every issue filed, PR opened, and benchmark reproduced is one more data point Squish didn't have before. Thanks for reading this far, now go break something." — it repeated the sentence right before it and the bullet list above it
• Folded a short sign-off into the sentence immediately before the closing image instead: "...I'd rather not be the only one who knows what it can do." → "...I'd rather not be the only one who knows what it can do. Break something and have fun."
• Image placement (squish-building.png) is unchanged; removing the trailing paragraph naturally leaves it as the last element before the footer divider

Type of change

• Bug fix
• New feature
• Performance improvement
• Documentation update
• Refactor / cleanup

Checklist

• No hardcoded absolute paths
• No model weights, eval output files, or log files staged for commit
• Changes are scoped to one logical concern (closing paragraph text)
• pytest tests/ passes locally — N/A, docs-only change
• ruff check squish/ tests/ reports no errors — N/A, no Python changed
• Performance-sensitive changes include a before/after squish bench run — N/A

Verified locally with mkdocs build: confirmed no remaining instance of the deleted paragraph's text anywhere on the page, confirmed the new closing sentence renders, and confirmed the image/footer disclaimer immediately follow with nothing extra in between.

Related issues

Follow-up to #215, #216, #217, #218.

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