REL: 3.9.0

What's Changed

• Merge v3.8.x branch up to main by @QuLogic in #79
• Always use search icon instead of search box by @dstansby in #83
• Remove old search.html template by @dstansby in #82
• Explain how to override default header links by @dstansby in #86
• MNT: Update version to 3.9.0rc1 by @QuLogic in #87

New Contributors

• @dstansby made their first contribution in #83

Full Changelog: v3.8.0...v3.9.0