Add droberts' comment to staging.yaml

https://github.com/dimagi/commcare-hq/commit/138fb08b0da7a98c49e5f3b42b80ac7ebc58d387#commitcomment-7004650
forgot to remove an old bootstrap3 reference in this template
Merge remote-tracking branch 'origin/archive-products+explicit_case_processing' into autostaging
Merge remote-tracking branch 'origin/auto-gps+schedule' into autostaging
Merge remote-tracking branch 'origin/auto-gps' into autostaging
Merge remote-tracking branch 'origin/schedule' into autostaging
Merge remote-tracking branch 'origin/active_domain' into autostaging
Merge remote-tracking branch 'origin/commconnect-reports' into autostaging
Merge remote-tracking branch 'origin/hq-dropdown' into autostaging
Merge remote-tracking branch 'origin/refactor-domain-copy2' into autostaging
Merge remote-tracking branch 'origin/logos' into autostaging
Merge branch 'vellum-requirejs' into autostaging
Merge remote-tracking branch 'origin/emwf-refactor' into autostaging
Merge remote-tracking branch 'origin/admin-reports' into autostaging
Merge remote-tracking branch 'origin/archive-products+archive-to-deactivate' into autostaging
Merge remote-tracking branch 'origin/opm' into autostaging
Merge remote-tracking branch 'origin/increase-es-timeout' into autostaging
Merge remote-tracking branch 'origin/parent-child-select-revised' into autostaging
Merge remote-tracking branch 'origin/archive-products' into autostaging
Merge branch 'vellum-requirejs+bootstrap3-stylin' into autostaging