chore: Update title from feedback (#6334)

# Description

## Problem\*

Update title

## Summary\*

Feedback from target audience

## Additional Context



## Documentation\*

Check one:
- [ ] No documentation needed.
- [ ] Documentation included in this PR.
- [ ] **[For Experimental Features]** Documentation to be submitted in a
separate PR.

# PR Checklist\*

- [ ] I have tested the changes locally.
- [ ] I have formatted the changes with [Prettier](https://prettier.io/)
and/or `cargo fmt` on default settings.

docs/docs/explainers/explainer-writing-noir.md

@@ -1,6 +1,6 @@
 ---
-title: Writing Performant Noir
-description: Understand new considerations when writing Noir
+title: Thinking in Circuits
+description: Considerations when writing Noir programs
 keywords: [Noir, programming, rust]
 tags: [Optimization]
 sidebar_position: 0