docs: Remove reference to outdated curated issues board (#45568)

Daniel Byiringiro created

The documentation referenced a “Curated board of issues” GitHub Project
that no longer exists.
The linked project returns a 404, and only three public projects are
currently available under
zed-industries.

This PR removes the outdated reference. Documentation-only change.

Release Notes:

- N/A

Change summary

CONTRIBUTING.md | 1 -
1 file changed, 1 deletion(-)

Detailed changes

CONTRIBUTING.md 🔗

@@ -23,7 +23,6 @@ In particular we love PRs that are:
 
 If you're looking for concrete ideas:
 
-- [Curated board of issues](https://github.com/orgs/zed-industries/projects/69) suitable for everyone from first-time contributors to seasoned community champions.
 - [Triaged bugs with confirmed steps to reproduce](https://github.com/zed-industries/zed/issues?q=is%3Aissue%20state%3Aopen%20type%3ABug%20label%3Astate%3Areproducible).
 - [Area labels](https://github.com/zed-industries/zed/labels?q=area%3A*) to browse bugs in a specific part of the product you care about (after clicking on an area label, add type:Bug to the search).