docs: add Deno to install instructions

[bartlomieju]

Summary

👋 Bartek from the Deno team here.

The install instructions list yarn and npm, but not Deno. Since Deno is a drop-in replacement for npm these days, I'd like to add a Deno line so Deno users have a copy-pasteable command, in parity with the others:

deno install urql

(As of Deno 2.8 there's no npm: prefix needed, it's the same command shape as npm install urql.)

Totally fine to close this if you'd rather keep the list short, no hard feelings. Happy to adjust wording, placement, or move it elsewhere.

Disclosure: I work on Deno, so I have an interest here. The goal is parity with the package managers you already list, not promotion. This PR was prepared with AI assistance under human supervision: I review every change myself and personally respond to any comments or review feedback.

Set of changes

• docs/basics/react-preact.md: added a deno install urql line to the existing install snippet, alongside the yarn add / npm install commands.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 58c5161

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR