[Docs] Document Deno config provider plugin

[DotDev262]

Description

Create documentation for the Deno plugin explaining what it does, how to configure it in config.yaml, and providing usage examples.

Plugin Source

The plugin lives at plugins/deno/ — see plugins/deno/src/plugin.py for available settings.

What to include

• Brief description of the plugin and what it manages
• Configuration format with all supported settings
• At least 2-3 real-world usage examples in config.yaml format
• Any prerequisites or notes (e.g., which OS is supported)
• Verification steps (how to confirm it works)

Reference

See existing doc files in docs/plugins/ for the expected format (e.g., docs/plugins/fzf.md, docs/plugins/go.md).

Acceptance Criteria

• Documentation created at docs/plugins/deno.md
• Entry added to the relevant table in docs/plugins/README.md
• Examples are tested and accurate
• POSIX trailing newline at end of file

[billu-beep]

hii, I am gssoc 2026 contributor , I would like to work on this .. please assign this to me

[DotDev262]

Assigned to @billu-beep (first requester). Please submit a PR when ready!

[billu-beep]

hello..can u plzz review the pr..