Remove unused colors from color palette

The color palette has been stripped down to a
maximum of two colors shades per palette. This
works for our design since components use a
base color with a lighter color as an accent
color. This change reduces the amount of CSS
generated by Bootstrap when the CSS is compiled.

Github Story: https://github.com/openbmc/webui-vue/issues/2

Signed-off-by: Derick Montague <derick.montague@ibm.com>
Change-Id: I2ddb37f5c89c749a7303799c6f7499ddd83d5a92
diff --git a/src/assets/styles/_buttons.scss b/src/assets/styles/_buttons.scss
index 02b0cae..2f961e0 100644
--- a/src/assets/styles/_buttons.scss
+++ b/src/assets/styles/_buttons.scss
@@ -7,12 +7,11 @@
 }
 
 .btn-primary {
-  fill: $white;
+  fill: currentColor;
 }
 
 .btn-secondary {
-  fill: $white;
-  @extend .btn-secondary-dark;
+  fill: currentColor;
 }
 
 .btn-link {