Better Pressbooks-build-tools Solution (for /packages/) (#637)

See: pressbooks/pressbooks#1834
`npm remove pressbooks-build-tools` from `./packages/`. 
`npm audit fix` where possible. Some particularities around `lerna`, still works like before.

.travis.yml

@@ -48,6 +48,7 @@ script:
 - if [[ ${TRAVIS_PHP_VERSION:0:3} == "7.3" ]]; then composer require pcov/clobber; vendor/bin/pcov clobber; vendor/bin/phpunit --configuration phpunit.xml --coverage-clover coverage.xml; fi
 - if [[ ${TRAVIS_PHP_VERSION:0:3} != "7.3" ]]; then vendor/bin/phpunit --configuration phpunit.xml; fi
 - composer standards
+- lerna run install-build-tools
 - lerna run test
 after_success:
 - bash <(curl -s https://codecov.io/bash)

packages/aetna/assets/styles/common/_variables.scss

@@ -99,18 +99,15 @@ $large: 1200px !default;
 $extra-large: 1650px !default;
 
 $breakpoint-not-small: "screen and (min-width: 30rem)" !default;
-$breakpoint-medium: "screen and (min-width: 30rem) and (max-width: 60rem)"
-  !default;
+$breakpoint-medium: "screen and (min-width: 30rem) and (max-width: 60rem)" !default;
 $breakpoint-large: "screen and (min-width: 60rem)" !default;
 $breakpoint-extra-large: "screen and (min-width: 90rem)" !default;
 $breakpoint-not-large: "screen and (max-width: 59.975rem)" !default;
-$breakpoint-max-content: "screen and (min-width: #{$content-max-width})"
-  !default;
+$breakpoint-max-content: "screen and (min-width: #{$content-max-width})" !default;
 
 $breakpoint-small-to-tablet: "screen and (max-width: 767px)" !default;
 $breakpoint-tablet-and-up: "screen and (min-width: 768px)" !default;
-$breakpoint-tablet-to-large: "screen and (min-width: 768px) and (max-width: 60em)"
-  !default;
+$breakpoint-tablet-to-large: "screen and (min-width: 768px) and (max-width: 60em)" !default;
 
 // Components
 //