- Replace achecker flags with a config file
- Bring back webhint
- Amend check-whole-site so that it will deploy to staging if all checks
pass, and then run webhint on every staging page.
Fixing the misaligned inline nav using "inline-block" also made it
obvious that I can simplify compound selectors. The max number of
compound selectors has dropped from 4 to 2. Update stylelint configs to
reflect this.
Also fix containment to reflect a prior change (webmentions are a
section, not a footer.)
