Community hub page at /community

## Summary

Create a `/community` landing page whose explicit goal is to **get more people actively involved in the GraphQL community**. Today "Community" is a dropdown menu with **no page behind it** — there's no single place that invites people to participate, and `/community` currently **404s** (even though `/resources` already links to it).

## Goal

Turn visitors into participants. The page is an **on-ramp**, organized as an involvement ladder from lowest-friction to deepest commitment, each step with a clear call to action.

## Proposed structure (involvement ladder)

1. **Hero** — "Get involved with GraphQL" + primary CTAs.
2. **Connect (lowest friction)** — join Official / Community / Vendor channels (chat, forums, social). _CTA: say hi._
3. **Show up** — attend or run a meetup; GraphQLConf. Pulls a highlight from the existing `/community/events` data. _CTA: find/host an event._
4. **Contribute** — code, docs, Working Groups, governance. _CTA: make your first contribution._
5. **Lead** — Ambassador Program (+ spotlight grid via `AmbassadorGrid`); later the Team page (#2428). _CTA: become an ambassador._
6. **Support** — the Foundation: join, members, grants. _CTA: join the Foundation._
7. **Looking for more** — cross-link Learn / Resources (reciprocate the link `/resources` already points here).

## Implementation notes

- App Router page `src/app/(main)/community/page.tsx`, mirroring `/resources` (`src/app/(main)/resources/page.tsx`).
- Reuse `ResourcesHero`, category-card components, `AmbassadorGrid`, `LookingForMore`.
- **Menu wiring:** add `route: "/community"` + an `index` item to the `community` menu in `src/pages/_meta.tsx` → dropdown automatically gains an **"Explore Community"** link (same code path `/resources` uses).

## Why now

`/resources` already links to `/community`, which 404s — the page is already expected to exist.

## Open questions

1. Which sections are **v1** vs. later.
2. Curated cards vs. live data (events feed, ambassadors grid).
3. Relationship to **Team page #2428** (where ambassadors/TSC render) and to `/resources` (avoid Tools & Libraries / training overlap).
4. Success metric for "more involved" — is there anything measurable we care about (channel joins, event signups, contributions)?

## Out of scope

- Reworking the individual subpages (channels, foundation, etc.) — this page links to them.

## Related

- #2428 — Team page on graphql.org (the **Lead/People** section renders here once it exists).

Bắt đầu với src/app/(main)/resources/page.tsx và src/app/(main)/community/page.tsx được đề xuất, sau đó kiểm tra ResourcesHero, category-card components, AmbassadorGrid, LookingForMore và menu cộng đồng trong src/pages/_meta.tsx. Xác định phạm vi v1 và các quyết định về dữ liệu trước khi triển khai involvement ladder. Hoàn tất khi /community render các section và CTA đã thống nhất, menu bao gồm “Explore Community” và liên kết /resources hiện có không còn trả về 404.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.