css: remove sass _flexbox-mixins (#42546)

static/amiens-metropole/style.scss

@@ -5,7 +5,6 @@
 @import '../includes/publik';
 @import '../includes/categories';
 @import '../includes/dashboard';
-@import '../includes/flexbox_mixins';
 @import 'forms';
 @import 'footer';
 @import 'header';

static/dreux/style.scss

@@ -2,5 +2,4 @@
 
 @import 'vars';
 @import '../includes/publik';
-@import '../includes/flexbox_mixins';
 @import 'custom';

static/grandlyon-sau/style.scss

@@ -2,7 +2,6 @@
 
 @import 'vars';
 @import '../includes/publik';
-@import '../includes/flexbox_mixins';
 @import '../includes/font-source-sans-pro';
 @import 'custom';
 @import 'categorie-demande';

static/hautes-alpes-2018/style.scss

@@ -4,7 +4,6 @@
 @import 'vars';
 @import '../includes/publik';
 @import '../includes/categories';
-@import '../includes/flexbox_mixins';
 @import 'custom';
 @import 'circle-steps';
 @import 'neutral-variant';

static/includes/_flexbox_mixins.scss

@@ -1,51 +0,0 @@
-// --------------------------------------------------
-// Flexbox SASS mixins
-// The spec: http://www.w3.org/TR/css3-flexbox
-// --------------------------------------------------
-// Flexbox display
-@mixin flexbox() {
-	display: -webkit-box;
-	display: -moz-box;
-	display: -ms-flexbox;
-	display: -webkit-flex;
-	display: flex;
-}
-// The 'flex' shorthand
-// - applies to: flex items
-// <positive-number>, initial, auto, or none
-@mixin flex($values) {
-	-webkit-box-flex: $values;
-	-moz-box-flex: $values;
-	-webkit-flex: $values;
-	-ms-flex: $values;
-	flex: $values;
-}
-// Flex Flow Direction
-// - applies to: flex containers
-// row | row-reverse | column | column-reverse
-@mixin flex-direction($direction) {
-	-webkit-flex-direction: $direction;
-	-moz-flex-direction: $direction;
-	-ms-flex-direction: $direction;
-	flex-direction: $direction;
-}
-// Display Order
-// - applies to: flex items
-// <integer>
-@mixin order($val) {
-	-webkit-box-ordinal-group: $val;
-	-moz-box-ordinal-group: $val;
-	-ms-flex-order: $val;
-	-webkit-order: $val;
-	order: $val;
-}
-// Axis Alignment
-// - applies to: flex containers
-// flex-start | flex-end | center | space-between | space-around
-@mixin justify-content($justify) {
-	-webkit-justify-content: $justify;
-	-moz-justify-content: $justify;
-	-ms-justify-content: $justify;
-	justify-content: $justify;
-	-ms-flex-pack: $justify;
-}

static/meyzieu-2018/_custom.scss

@@ -130,7 +130,7 @@ div#nav {
 		margin-bottom: 2ex;
 		.carrousel-wrapper {
 			display: flex;
-			@include flex(0 0 calc(#{$width} - #{$sidebar-width}));
+			flex: 0 0 calc(#{$width} - #{$sidebar-width});
 			@media screen and ($max-mobile-viewport) {
 				flex-direction: column;
 				flex: 0;

static/meyzieu-2018/style.scss

@@ -2,5 +2,4 @@
 
 @import "vars";
 @import "../includes/publik";
-@import "../includes/flexbox_mixins";
 @import "custom";