Fix example catalog encoding in examples/README.md

[DKFuH]

Summary

The example catalog currently contains broken emoji/encoding output in section headings. Clean this up so the file renders cleanly on GitHub and stays ASCII-friendly unless Unicode is clearly intentional.

Why this matters

The examples catalog is one of the first entry points for new contributors. Broken rendering makes the repo look less polished than it is.

Scope

• inspect examples/README.md
• replace broken heading markers with clean text or intentional emoji
• keep the document easy to read on GitHub
• avoid changing the structure of the example catalog

Definition of done

• examples/README.md renders cleanly
• no broken encoding artifacts remain
• the file still reads naturally on GitHub

Notes

This is intentionally small and beginner-friendly.