Add missing ref to "top"
Add missing ref to "top"

All section links reference an anchor which seems to be missing from the codebase: `#top`. The existing `nav` element with class `top-nav` appears to be the best candidate.
TheLastCicada/Engineering-Best-Practices,10up/Engineering-Best-Practices,10up/Engineering-Best-Practices,10up/Engineering-Best-Practices,TheLastCicada/Engineering-Best-Practices,TheLastCicada/Engineering-Best-Practices