Fixing a handful of issues across our docs with the flexbox move.
- Fixes #20586 (closed) where the "outline" on custom controls was misaligned.
- Replaces #21270 with a fix for all
.form-control-statics, not just inline ones. - Fixes #21280 (closed) by moving stacked custom controls to flexbox.
- Fixes misaligned items in inline form groups with
align-items: center. - Fixes #21135 (closed) by moving
.col-form-labelpadding settings to acalcfunction.
Might have a few more still to come.