Remove unused font variables and adjust components accordingly

src/styles/sidebar/components/excerpt.scss

@@ -35,7 +35,6 @@
   .excerpt__toggle-link {
     padding-left: 15px;
     background-image: linear-gradient(to right, transparent 0px, white 12px);
-    line-height: var.$normal-line-height;
   }
 
   .excerpt__toggle-button {

src/styles/sidebar/components/tag-editor.scss

@@ -19,7 +19,6 @@
   &__item {
     display: flex;
     margin: 0.25em 0.5em 0.25em 0;
-    line-height: var.$base-line-height;
   }
 
   &__edit {
@@ -28,7 +27,7 @@
     border: 1px solid var.$grey-3;
     border-radius: 2px 0 0 2px;
     border-right-width: 0;
-    padding: 0 0.5em;
+    padding: 2px 0.5em;
   }
 
   &__delete {

src/styles/sidebar/components/tag-list.scss

@@ -7,8 +7,7 @@
 
   &__item {
     margin: 0.25em 0.5em 0.25em 0;
-    padding: 0 0.5em;
-    line-height: var.$base-line-height;
+    padding: 2px 0.5em;
     background: var.$grey-0;
     border: 1px solid var.$grey-3;
     border-radius: 2px;

src/styles/variables.scss

@@ -70,20 +70,6 @@ $sans-font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande',
   sans-serif !default;
 $mono-font-family: Open Sans Mono, Menlo, DejaVu Sans Mono, monospace !default;
 
-$base-font-size: 12px !default;
-$base-line-height: 20px !default;
-
-$body1-font-size: 12px;
-$body1-line-height: 1.4em;
-
-$body2-font-size: 14px;
-
-$normal-font-size: 13px;
-$normal-line-height: 17px;
-
-$small-font-size: 11px;
-$small-line-height: 15px;
-
 // Transitional Typography (Temporary)
 // -----------------------------------
 
@@ -123,23 +109,23 @@ $popup-menu-shadow: 0 1px 1px rgba(0, 0, 0, 0.1);
 
 @mixin font-tiny {
   font-size: 10px;
-  line-height: $small-line-height;
+  line-height: 14px;
   font-weight: 400;
 }
 
 @mixin font-small {
-  font-size: $small-font-size;
-  line-height: $small-line-height;
+  font-size: 11px;
+  line-height: 15px;
   font-weight: 400;
 }
 
 @mixin font-normal {
-  font-size: $normal-font-size;
-  line-height: $normal-line-height;
+  font-size: 13px;
+  line-height: 17px;
   font-weight: 400;
 }
 
 @mixin font-big {
-  font-size: $body2-font-size;
-  line-height: $base-line-height;
+  font-size: 14px;
+  line-height: 20px;
 }