Drop: Device-named container variables since we alreay sort of deprecated them many releases ago

dist/css/bootstrap.css

@@ -756,17 +756,17 @@ pre code {
 }
 @media (min-width: 768px) {
   .container {
-    width: 750px;
+    width: 720px;
   }
 }
 @media (min-width: 992px) {
   .container {
-    width: 970px;
+    width: 940px;
   }
 }
 @media (min-width: 1200px) {
   .container {
-    width: 1170px;
+    width: 1140px;
   }
 }
 .container-fluid {

docs/dist/css/bootstrap.css

@@ -756,17 +756,17 @@ pre code {
 }
 @media (min-width: 768px) {
   .container {
-    width: 750px;
+    width: 720px;
   }
 }
 @media (min-width: 992px) {
   .container {
-    width: 970px;
+    width: 940px;
   }
 }
 @media (min-width: 1200px) {
   .container {
-    width: 1170px;
+    width: 1140px;
   }
 }
 .container-fluid {

less/variables.less

@@ -269,34 +269,28 @@
 //## Define your custom responsive grid.
 
 //** Number of columns in the grid.
-@grid-columns:              12;
+@grid-columns:               12;
 //** Padding between columns. Gets divided in half for the left and right.
-@grid-gutter-width:         30px;
+@grid-gutter-width:          30px;
 // Navbar collapse
 //** Point at which the navbar becomes uncollapsed.
-@grid-float-breakpoint:     @screen-sm-min;
+@grid-float-breakpoint:      @screen-sm-min;
 //** Point at which the navbar begins collapsing.
-@grid-float-breakpoint-max: (@grid-float-breakpoint - 1);
+@grid-float-breakpoint-max:  (@grid-float-breakpoint - 1);
 
 
 //== Container sizes
 //
 //## Define the maximum width of `.container` for different screen sizes.
 
-// Small screen / tablet
-@container-tablet:             ((720px + @grid-gutter-width));
 //** For `@screen-sm-min` and up.
-@container-sm:                 @container-tablet;
+@container-sm:               720px;
 
-// Medium screen / desktop
-@container-desktop:            ((940px + @grid-gutter-width));
 //** For `@screen-md-min` and up.
-@container-md:                 @container-desktop;
+@container-md:               940px;
 
-// Large screen / wide desktop
-@container-large-desktop:      ((1140px + @grid-gutter-width));
 //** For `@screen-lg-min` and up.
-@container-lg:                 @container-large-desktop;
+@container-lg:               1140px;
 
 
 //== Navbar