Update IBM .env styles

Removed Sass theme-color map. With Bootstrap's use of the !default
and env import order, these variable assignments are all that is
needed to leverage built-in color/theme maps.
Also removed IBM gray palette since gray overrides were causing
unwanted color changes in the form controls.

Signed-off-by: Yoshie Muranaka <yoshiemuranaka@gmail.com>
Change-Id: Iea0af2fe7cbc8ac365c2ec440bca63c60b10e527
diff --git a/src/env/assets/styles/_ibm.scss b/src/env/assets/styles/_ibm.scss
index f1bf432..12fe0bc 100644
--- a/src/env/assets/styles/_ibm.scss
+++ b/src/env/assets/styles/_ibm.scss
@@ -37,21 +37,13 @@
 
 $font-family-base: 'Plex', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
 
-// IBM gray palette
-$gray-100: #F4F4F4;
-// $gray-200: #E0E0E0; Use default OpenBMC $gray-200
-// $gray-300: #C6C6C6; Use default OpenBMC $gray-300
-$gray-400: #A8A8A8;
-$gray-500: #8D8D8D;
-$gray-600: #6F6F6F;
-$gray-700: #525252;
-$gray-800: #333333;
-$gray-900: #161616;
-
 // IBM theme colors
-$theme-colors: (
-  "primary": #0F62FE,
-  "danger": #DA1E28,
-  "success": #24A146,
-  "warning": #F1C21B
-);
\ No newline at end of file
+$blue: #0F62FE;
+$red: #DA1E28;
+$green: #24A146;
+$yellow: #F1C21B;
+
+$primary: $blue;
+$danger: $red;
+$success: $green;
+$warning: $yellow;