remove useless variables

assets/sass/_theme/_configuration.sass

@@ -16,10 +16,6 @@ $link-color: $color-text !default
 $body-font-family: "Baskerville", "Times New Roman", "Times", serif !default
 $heading-font-family: "Helvetica Neue", "Helvetica", "Arial", sans-serif !default
 
-// Base
-$font-size-base: 16px !default
-$line-height-base: 160% !default
-
 // Headings
 $heading-font-weight: normal !default
 

assets/sass/_theme/_utils.sass

@@ -212,7 +212,7 @@
                 @include arrow-right-hover
                 display: block
                 &::after
-                    font-size: $font-size-base
+                    font-size: px2rem(16)
                     transform: translateX(0)
                     position: relative
                 &:hover
@@ -277,7 +277,7 @@
 
 @mixin button-icon($icon: false)
     @include button-reset
-    line-height: $line-height-base
+    line-height: $body-line-height
     border: 1px solid $hero-color
     padding: $spacing0 $spacing1
     white-space: nowrap
@@ -299,7 +299,7 @@
     display: flex
     justify-content: space-between
     align-items: center
-    @include icon("arrow-right", after,  $small-size)
+    @include icon("arrow-right", after, $small-size)
         opacity: 0
         transform: translateX(-20px)
         transition: 0.55s $arrow-ease-transition

assets/sass/_theme/design-system/typography.sass

@@ -7,7 +7,7 @@ body
     font-size: $body-size
     font-variant-ligatures: common-ligatures
     text-rendering: optimizelegibility
-    line-height: $line-height-base
+    line-height: $body-line-height
     word-break: break-word
     @include media-breakpoint-up(md)
         font-size: $body-size-md