Félix Malfait 0dec4b9b67 docs: add IS_MULTIWORKSPACE_ENABLED documentation (#16758)
## Summary

Adds comprehensive documentation for the `IS_MULTIWORKSPACE_ENABLED`
configuration variable, which was previously undocumented despite being
a fundamental configuration option that significantly changes how Twenty
behaves.

## Changes

### Self-Host Setup Guide (`setup.mdx`)

Added a new **Multi-Workspace Mode** section that explains:

- **Single-workspace mode (default)**: Only one workspace allowed, first
user gets admin privileges, signups disabled after first workspace
- **Multi-workspace mode**: Multiple workspaces with subdomain-based
URLs (e.g., `sales.your-domain.com`)
- **Related config variables**: `DEFAULT_SUBDOMAIN` and
`IS_WORKSPACE_CREATION_LIMITED_TO_SERVER_ADMINS`
- **DNS configuration**: Wildcard DNS setup for dynamic subdomains
- **Workspace creation restrictions**: How to limit workspace creation
to server admins

### Local Setup Guide (`local-setup.mdx`)

Added an info callout in the environment variables section to make
contributors aware of multi-workspace mode, useful when testing
subdomain-based features.

## Why This Matters

The `IS_MULTIWORKSPACE_ENABLED` variable controls:
- Whether multiple workspaces can exist on a single instance
- URL structure (plain domain vs subdomains)
- First user privileges
- Sign-up behavior after initial setup
- SSO workspace resolution logic

This is critical knowledge for self-hosters who want to run Twenty as a
multi-tenant SaaS.
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Installation

See: 🚀 Self-hosting 🖥️ Local Setup

Does the world need another CRM?

We built Twenty for three reasons:

CRMs are too expensive, and users are trapped. Companies use locked-in customer data to hike prices. It shouldn't be that way.

A fresh start is required to build a better experience. We can learn from past mistakes and craft a cohesive experience inspired by new UX patterns from tools like Notion, Airtable or Linear.

We believe in Open-source and community. Hundreds of developers are already building Twenty together. Once we have plugin capabilities, a whole ecosystem will grow around it.


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