[DOC] Add NEAR Playground

[thisisjoshford]

Documentation Type

New Documentation

What needs documentation?

NEAR Playground has launched as a simple web-based IDE to quickly modify and deploy smart contracts on NEAR. We should consider adding them to docs for better visibility to the developer community.

Acceptance Criteria

• Add links in relevant sections of docs to NEAR Playground

Resources & References

No response

Priority

🟡 P2 : Documentation Enhancement