docs(community): add governance and join-a-council pages

[najuna-brian]

Description

This adds the ODE Governance Framework v1.0 (voted in on 19 Sep 2026) to the docs site, so people can see how ODE is governed and apply for a council seat.

Page	Address	What it shows
Governance	/docs/community/governance	Roles, what each council covers, and where seats are open
Join a council	/docs/community/governance/join-a-council	Who can apply, how selection works, what we look at
Application form	/councils/apply.html	A simple form; it saves the answers as a .txt file and opens an email to hello@opendataensemble.org

The new pages sit under Community → Governance in the sidebar, and the Community page links to them. Member names are not listed; the pages only say which councils have seats available.

The form is a single static HTML file with no new dependencies. It works on phones and laptops.

Type of Change

• Documentation

Component(s) Changed

• Documentation / DevOps / CI

Testing

• Manually tested

pnpm run build and pnpm run test pass. Checked the pages and the form at phone and laptop sizes; nothing scrolls sideways, and the form downloads the file and opens the email.

Checklist

• Pre-flight checks for changed packages passed (lint / format / tests)
• Related issue linked

Related: OpenDataEnsemble/.github (GOVERNANCE.md) because the docs pages link to it.

[r0ssing]

Thanks @najuna-brian!