updated _tables and fixed up graphics to better use slate

_tables.sass

@@ -9,6 +9,22 @@
     width: 50%
     text-align: left
 
+.two-column-definitions
+  width: 100%
+  table-layout: fixed
+
+  colgroup
+    col:first-child
+      width: 20%
+    col:last-child
+      width: 80%
+    
+  th
+    text-transform: uppercase
+
+  th, td
+    text-align: left
+
 
 .two-column-desc
   width: 100%

categories/graphics.sass

@@ -4,6 +4,7 @@
 @use '../org-base'
 
 @use '../themes/modern-slate' as * 
+// @use '../themes/sienna-elegance' as * 
 @use '../fonts' as fonts
 @use '../mixins' as mixins-basic
 
@@ -46,17 +47,17 @@ blockquote
 table
   color: $table-color
 
-th, td
-  border-color: $table-border-color
-
 th
   background-color: $table-header-bg
   color: $table-header-color
   font-family: $secondary-font
 
+th, td
+  border-color: $table-border-color
+
+tr:nth-child(odd)
+  background-color: color.adjust($table-header-bg, $lightness: -10%)
 
-tr:nth-child(even)
-  background-color: color.adjust($background-color, $lightness: 5%)
 
 /* Code Block Styles */
 pre, code