Removed unused line height variables created for experimenting

Author: djanelle-mit

app/assets/stylesheets/partials/_variables.scss

@@ -14,13 +14,9 @@ $fs-xxlarge:   3.2rem;
 $fs-xxxlarge:  4.2rem; // unused by default
 $fs-xxxxlarge: 5.2rem;
 
-$fw-normal: 400;
+$fw-normal:   400;
 $fw-semibold: 600;
-$fw-bold:   700;
+$fw-bold:     700;
 
-$lh-xtight:  .92;
-$lh-tight: 1.1;
+$lh-xtight: 0.92;
 $lh-base:   1.2;
-$lh-loose: 1.35;
-$lh-xloose: 1.5;
-$lh-xxloose: 1.6;