fix(Nav): update dashboard link to point to sign-up page (#43384)

## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

Yes

## What kind of change does this PR introduce?

Redirect to the signup page for "Start your project" button

## What is the current behavior?

That button redirects to signin page

## What is the new behavior?

Redirects to signup page

## Additional context

Add any other context or screenshots.

apps/www/components/Nav/MobileMenu.tsx

@@ -1,24 +1,22 @@
 'use client'
 
-import { AnimatePresence, LazyMotion, domAnimation, m } from 'framer-motion'
+import staticContent from '.generated/staticContent/_index.json'
+import ProductModulesData from '~/data/ProductModules'
+import { DEFAULT_EASE } from '~/lib/animations'
+import { useSendTelemetryEvent } from '~/lib/telemetry'
+import { useIsLoggedIn, useIsUserLoading } from 'common'
+import * as supabaseLogoWordmarkDark from 'common/assets/images/supabase-logo-wordmark--dark.png'
+import * as supabaseLogoWordmarkLight from 'common/assets/images/supabase-logo-wordmark--light.png'
+import { AnimatePresence, domAnimation, LazyMotion, m } from 'framer-motion'
+import { ChevronRight } from 'lucide-react'
 import Image from 'next/image'
 import Link from 'next/link'
 import { useEffect } from 'react'
 import type { Dispatch, SetStateAction } from 'react'
-
 import { Accordion, Button, TextLink } from 'ui'
-import { DEFAULT_EASE } from '~/lib/animations'
+
 import MenuItem from './MenuItem'
 
-import { useIsLoggedIn, useIsUserLoading } from 'common'
-import * as supabaseLogoWordmarkDark from 'common/assets/images/supabase-logo-wordmark--dark.png'
-import * as supabaseLogoWordmarkLight from 'common/assets/images/supabase-logo-wordmark--light.png'
-import { ChevronRight } from 'lucide-react'
-import ProductModulesData from '~/data/ProductModules'
-import staticContent from '.generated/staticContent/_index.json'
-
-import { useSendTelemetryEvent } from '~/lib/telemetry'
-
 interface Props {
   open: boolean
   setOpen: Dispatch<SetStateAction<boolean>>
@@ -294,7 +292,7 @@ const MobileMenu = ({ open, setOpen, menu }: Props) => {
                         </Button>
                       </Link>
                       <Link
-                        href="https://supabase.com/dashboard"
+                        href="https://supabase.com/dashboard/sign-up"
                         passHref
                         legacyBehavior
                         onClick={() =>

apps/www/components/Nav/index.tsx

@@ -1,24 +1,22 @@
 'use client'
 
+import { useIsLoggedIn, useIsUserLoading, useUser } from 'common'
+import { getMenu } from 'data/nav'
+import { DevToolbarTrigger } from 'dev-tools'
+import { useSendTelemetryEvent } from 'lib/telemetry'
 import dynamic from 'next/dynamic'
 import Link from 'next/link'
+import { usePathname } from 'next/navigation'
 import React, { useState } from 'react'
 import { useWindowSize } from 'react-use'
-
-import { useIsLoggedIn, useIsUserLoading, useUser } from 'common'
-import { DevToolbarTrigger } from 'dev-tools'
 import { Button, buttonVariants, cn } from 'ui'
 import { AuthenticatedDropdownMenu } from 'ui-patterns'
 
-import { useSendTelemetryEvent } from 'lib/telemetry'
 import GitHubButton from './GitHubButton'
 import HamburgerButton from './HamburgerMenu'
 import RightClickBrandLogo from './RightClickBrandLogo'
 import useDropdownMenu from './useDropdownMenu'
 
-import { getMenu } from 'data/nav'
-import { usePathname } from 'next/navigation'
-
 const MenuItem = dynamic(() => import('./MenuItem'))
 const MobileMenu = dynamic(() => import('./MobileMenu'))
 const NavigationMenu = dynamic(() =>
@@ -182,7 +180,7 @@ const Nav = ({ hideNavbar, stickyNavbar = true }: Props) => {
                       </Button>
                       <Button className="hidden lg:block" asChild>
                         <Link
-                          href="https://supabase.com/dashboard"
+                          href="https://supabase.com/dashboard/sign-up"
                           onClick={() =>
                             sendTelemetryEvent({
                               action: 'start_project_button_clicked',