Remove unused stylesheets

assets/sass/base/_layout.sass

@@ -1,34 +0,0 @@
-.is-centered
-    margin: 0 auto
-
-.is-half
-    width: 50%
-
-.flex
-    flex: 1
-
-.flex-wrap
-    flex-wrap: wrap
-
-.list-style-none
-    list-style: none !important
-
-.align-items-center
-  align-items: center
-
-@each $value in 'top', 'middle', 'bottom'
-    .table
-        & > thead > tr > th,
-        & > thead > tr > td,
-        & > tbody > tr > th,
-        & > tbody > tr > td,
-        & > tfoot > tr > th,
-        & > tfoot > tr > td
-            &.vertical-#{$value}
-                vertical-align: #{$value}
-
-$properties: ( mb: 'margin-bottom', ml: 'margin-left', mr: 'margin-right', mt: 'margin-top', pb: 'padding-bottom', pl: 'padding-left', pr: 'padding-right', pt: 'padding-top' )
-@each $key, $property in $properties
-    @for $value from 1 through 5
-        .#{$key}-#{$value}
-            #{$property}: #{$value}em !important

assets/sass/base/_utilities.sass

@@ -1,5 +0,0 @@
-.is-borderless
-    border: none !important
-
-.is-circle
-    border-radius: 50%