docs: document Require personal GitHub accounts workspace setting

[tembo]

What changed

Adds a "Require personal GitHub accounts" accordion item to the GitHub integration doc's Advanced section, documenting the new workspace admin setting that requires members to connect their personal GitHub account before starting sessions.

Why

The product shipped a new org-level enforcement toggle for personal GitHub account linking, but the docs only covered the existing opt-in attribution flow. There was no mention of the new admin-only requirement or where to enable it.

Evidence

• monorepo PR tembo/monorepo#10765 "Enforce personal GitHub accounts per workspace"
• apps/web/components/workspace/personal-github-requirement.tsx — new "Require personal GitHub accounts" switch, exact title/description copy, gated to hasAdminPermissions
• apps/web/components/workspace/index.tsx — rendered under a new "Session requirements" section on the Workspace settings page (/settings/workspace)
• apps/api/src/server/routes/settings.ts — new enforceLinkedGithubAccount setting key, restricted to org admins via ADMIN_ONLY_SETTING_KEYS

Confidence

This is a merged, fully shipped setting with a dedicated UI switch, backend validation, and admin-only authorization already on main. The docs addition states only the setting's exact label, its effect, and its location, matching the "Attribution" accordion's existing style and scope.

cc @benja

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---

Note

Low Risk
Documentation-only change with no runtime or security impact.

Overview
Adds an Advanced accordion in the GitHub integration docs for workspace admins who can mandate personal GitHub linking before members start sessions.

It explains the Require personal GitHub accounts toggle under Session requirements on Workspace settings, complementing the existing optional attribution guidance.

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[tembo]

Requesting review from @benja who has experience with the following files modified in this PR:

• integrations/github.mdx

[tembo]

The documentation edit is correct, but this should wait for the underlying product change to reach a published production release.

• tembo/monorepo#10765 merged on August 27.
• The latest published release, v0.2.828, predates that merge.
• The change is listed in draft release v0.2.829, which has not yet been published or deployed to production.

Recommendation: hold this PR until v0.2.829 (or a later release containing #10765) is published and its production deployment succeeds.