RND-6843: columns block

[BrettJephson]

Adds a columns block to document:

[changeset-bot]

🦋 Changeset detected

Latest commit: c3cfbe6

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
gitbook-v2	Patch
gitbook	Patch

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[linear]

RND-6843 Layout block, some way of putting content side-by-side

[github-actions]

Summary of the deployments:

Version 1

Version	URL	Status
Latest commit	https://951044ee.gitbook-open.pages.dev	✅
PR	https://pr3257.gitbook-open.pages.dev	✅

Version 2

Version	URL	Status
Vercel	https://gitbook-v2-6erpj29zo-gitbook.vercel.app	✅
Cloudflare	https://82e1b47e-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	v1	2v	2c
GitBook	https://951044ee.gitbook-open.pages.dev/gitbook.com/docs	https://gitbook-v2-6erpj29zo-gitbook.vercel.app/url/gitbook.com/docs	https://82e1b47e-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://951044ee.gitbook-open.pages.dev/gitbook.gitbook.io/test-gitbook-open	https://gitbook-v2-6erpj29zo-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://82e1b47e-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

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Build	Status	Details	Updated (UTC)
customers-v1 (Inspect)	✅ No changes detected	-	Jun 4, 2025, 11:26 PM
customers-v2 (Inspect)	⚠️ Changes detected (Review)	79 changed	Jun 4, 2025, 11:28 PM
default (Inspect)	⚠️ Changes detected (Review)	4 added	Jun 4, 2025, 11:29 PM
v2-cloudflare (Inspect)	⚠️ Changes detected (Review)	4 added	Jun 4, 2025, 11:31 PM
v2-vercel (Inspect)	⚠️ Changes detected (Review)	4 added	Jun 4, 2025, 11:30 PM