Support tile order in dashboard yml

[JCZuurmond]

Resolves #131

Integration test that changes tile order using the metadata yml

• [x] Update docs

[github-actions[bot]]

✅ 34/34 passed, 3 flaky, 2 skipped, 11m8s total

Flaky tests:

• 🤪 test_dashboard_deploys_dashboard_with_counter_variation (13.488s)
• 🤪 test_dashboards_deploys_dashboard_with_filters (15.487s)
• 🤪 test_dashboards_deploys_dashboard_from_query_with_cte (25.367s)

_{Running from acceptance #251}