Update global typography

Updated the following body, label, and heading
styles to match new style guide:
- Font sizes
- Font weight
- Line height
- Color

Signed-off-by: Dixsie Wolmers <dixsie@ibm.com>
Change-Id: I014c968f6542b697fec8c3b9af781e64ac10794d
diff --git a/src/components/Global/PageSection.vue b/src/components/Global/PageSection.vue
index 6f44a3a..96f7134 100644
--- a/src/components/Global/PageSection.vue
+++ b/src/components/Global/PageSection.vue
@@ -25,7 +25,7 @@
 }
 
 h2 {
-  @include font-size($h4-font-size);
+  @include font-size($h3-font-size);
   margin-bottom: $spacer;
   &::after {
     content: '';