Add /go/ask-supabase-select Select 2026 recap page (#50889)

## Problem

Attendees at Supabase Select 2026 need a quick, linkable page that
recaps what shipped and points them to the right next step, whether
that's a theme blog post, a solution page, or the full features
directory.

## Solution

Added `/go/ask-supabase-select` using the go-page system (`GoPageInput`
config, no bespoke React):

- **Hero**: "Build in an instant. Scale to infinity." with a "Read the
Recap" CTA
- **Our announcements**: three theme cards (Build anything, Scale
without limits, Operate with confidence), each with a blurb sourced from
the drafted Select 2026 theme blog posts and a CTA to that post
- **Explore Supabase for your team**: a 2x2 grid of solution cards (AI
Builders, Startups, Developers, Enterprise), each fully clickable to its
solutions page
- **Supabase features**: closing CTA out to `/features`

Also adds `whitespace-pre-line` support to the shared go-page
`HeroSection` component so a hero description can wrap onto a second
line when the config string includes `\n`. This is additive and doesn't
change rendering for existing `/go` pages that don't use a line break.

Note: the "Read the Build/Scale/Operate Blog" and "Read the Recap" CTAs
currently point to `/docs` as a placeholder — the real blog posts are
still in progress and will be swapped in once published.

## Review instructions

1. Run `pnpm --filter www dev` and visit
`http://localhost:3000/go/ask-supabase-select`.
2. Confirm the three announcement cards, the four solution cards
(hover/click highlight, no button chrome), and the closing features CTA
all render and link correctly.

## Checklist

- [x] I have read CONTRIBUTING.md

🤖 Generated with [Claude Code](https://claude.com/claude-code)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **New Features**
* Added the “Ask Supabase” landing page, with product resources,
documentation links, team-solution cards, and a blog post marked as
coming soon.
* **Improvements**
* Hero descriptions now preserve line breaks for clearer text
presentation.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: Wendie Cheung <wendie.cheung@supabase.io>
Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>

packages/marketing/src/go/sections/HeroSection.tsx

@@ -43,7 +43,7 @@ export default function HeroSection({
           {section.description && (
             <p
               className={cn(
-                'text-lg leading-relaxed text-foreground-light text-pretty',
+                'text-lg leading-relaxed text-foreground-light text-pretty whitespace-pre-line',
                 !hasMedia && 'md:text-xl md:text-foreground max-w-2xl'
               )}
             >