[Cloudflare One] Update Keycloak SAML docs

[kennyj42]

Closes https://jira.cfdata.org/browse/AUTH-8879

Summary

• Updates the Keycloak SAML setup steps for the current Admin Console
• Changes Keycloak SAML URL examples to the v17+ default path without /auth
• Adds a v16-and-earlier compatibility note
• Removes stale Keycloak v16 screenshots and the old lab repo link

Validation

• pnpm exec prettier --check src/content/docs/cloudflare-one/integrations/identity-providers/keycloak.mdx passed
• git diff --check passed
• pnpm run check fails on generated skills/turnstile-spin Worker template types unrelated to this change (ExportedHandler / Fetcher missing)

[cloudflare-docs-bot]

Review

⚠️ 1 warning found in commit fe78cb5.

Fix in your agent

Fix the following review findings in PR #32071 (https://github.com/cloudflare/cloudflare-docs/pull/32071).

Before making changes, review each finding and present a brief summary table:
- For each finding, state whether you agree, disagree, or need clarification
- If you disagree (e.g. the fix requires disproportionate effort for minimal benefit,
  or the finding is factually incorrect), explain why
- If you need clarification before deciding, ask those questions
- Then share your plan for which issues to tackle and in what order

After triaging, fix all legitimate findings. For any you decide to skip,
post a comment on this PR with the finding ID and your reasoning.

---

## Style Guide Review

### Warnings (1)

#### SG-690f10b9299b · Use turn on/turn off for toggles
- **File:** `src/content/docs/cloudflare-one/integrations/identity-providers/keycloak.mdx` line 51
- **Issue:** Added line reads `If you wish to enable client signatures, enable **Client Signature Required** and select **Save**.`
- **Fix:** Replace `enable` with `turn on` for the toggle: `If you want to turn on client signatures, turn on **Client Signature Required** and select **Save**.`

Code Review

This code review is in beta and may not always be helpful — use your judgment.

_{No code review issues found.}

Conventions

_{No convention issues found.}

Style Guide Review

Warnings (1)

File	Issue
cloudflare-one/integrations/identity-providers/keycloak.mdx line 51	Use turn on/turn off for toggles — Added line reads If you wish to enable client signatures, enable \*\*Client Signature Required\*\* and select \*\*Save\*\*. Fix: Replace enable with turn on for the toggle: If you want to turn on client signatures, turn on \*\*Client Signature Required\*\* and select \*\*Save\*\*.

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