Official Ballot Release for STU 1

What's Changed

• Remove STU note by @mrinnetmaki in #24
• Quality Assurance by @mrinnetmaki in #25
• Add contributor by @mikajylha in #27
• Bump version to 1.0.0-rc5, label ballot by @mrinnetmaki in #26
• Fix build.fhir.org links by @mrinnetmaki in #29
• Final fixes for official ballot release by @mrinnetmaki in #30

New Contributors

• @mikajylha made their first contribution in #27

Full Changelog: v1.0.0-rc2...v1.0.0-rc5