feat: add teams (#848)

## Description

Add support for teams which will allow users to collaborate on
documents.

Teams features allows users to:

- Create, manage and transfer teams
- Manage team members
- Manage team emails
- Manage a shared team inbox and documents

These changes do NOT include the following, which are planned for a
future release:

- Team templates
- Team API
- Search menu integration

## Testing Performed

- Added E2E tests for general team management
- Added E2E tests to validate document counts

## Checklist

- [X] I have tested these changes locally and they work as expected.
- [X] I have added/updated tests that prove the effectiveness of these
changes.
- [ ] I have updated the documentation to reflect these changes, if
applicable.
- [X] I have followed the project's coding style guidelines.

apps/web/src/components/(dashboard)/settings/layout/mobile-nav.tsx

@@ -1,11 +1,11 @@
 'use client';
 
-import { HTMLAttributes } from 'react';
+import type { HTMLAttributes } from 'react';
 
 import Link from 'next/link';
 import { usePathname } from 'next/navigation';
 
-import { CreditCard, Lock, User } from 'lucide-react';
+import { CreditCard, Lock, User, Users } from 'lucide-react';
 
 import { useFeatureFlags } from '@documenso/lib/client-only/providers/feature-flag';
 import { cn } from '@documenso/ui/lib/utils';
@@ -38,6 +38,19 @@ export const MobileNav = ({ className, ...props }: MobileNavProps) => {
         </Button>
       </Link>
 
+      <Link href="/settings/teams">
+        <Button
+          variant="ghost"
+          className={cn(
+            'w-full justify-start',
+            pathname?.startsWith('/settings/teams') && 'bg-secondary',
+          )}
+        >
+          <Users className="mr-2 h-5 w-5" />
+          Teams
+        </Button>
+      </Link>
+
       <Link href="/settings/security">
         <Button
           variant="ghost"