v5: Unify spacing across components (!30564) · Merge requests · Bootstrap / bootstrap

Merged Mark Otto requested to merge v5-unify-spacing into master Apr 11, 2020

Updates horizontal padding across alerts, cards, dropdowns, list groups, and modals to be our default $spacer of 1rem
Reassigns some variables to improve ease of customization
~~Restyles the breadcrumb a smidge to make the background lighter for improved contrast and a little less vertical padding~~