Remove linear RGB gradientsn from demo page

demo.html

@@ -73,9 +73,6 @@
       use in maps.  More information about them, including interactive
       demo, can be found at
       <a href=http://colorbrewer2.org>colorbrewer2.org</a>.
-    <p>RGB gradients denoted “linear” calculate colour value without
-      applying <a href=https://en.wikipedia.org/wiki/Gamma_correction>gamma
-      compression</a>.  As such, they don’t take human perception into account.
     <p>Soralized palette have been designed by Ethan Schoonover for use with
       terminal and GUI applications.  As such, it has not been optimised for use
       in graphs or maps, but the library includes them nonetheless.  More

demo.js

@@ -213,34 +213,13 @@
     add('HSV Rainbow (s=.5, v=.5)', 'rainbow', 0.5, 0.5);
 
     addHeading('RGB gradients');
-    add('Red',
-        function(x) { return palette.rgbColor(x, 0, 0); });
-    add('Red (linear)',
-        function(x) { return palette.linearRgbColor(x, 0, 0); });
-    add('Green',
-        function(x) { return palette.rgbColor(0, x, 0); });
-    add('Green (linear)',
-        function(x) { return palette.linearRgbColor(0, x, 0); });
-    add('Blue',
-        function(x) { return palette.rgbColor(0, 0, x); });
-    add('Blue (linear)',
-        function(x) { return palette.linearRgbColor(0, 0, x); });
-    add('Yellow',
-        function(x) { return palette.rgbColor(x, x, 0); });
-    add('Yellow (linear)',
-        function(x) { return palette.linearRgbColor(x, x, 0); });
-    add('Magenta',
-        function(x) { return palette.rgbColor(x, 0, x); });
-    add('Magenta (linear)',
-        function(x) { return palette.linearRgbColor(x, 0, x); });
-    add('Cyan',
-        function(x) { return palette.rgbColor(0, x, x); });
-    add('Cyan (linear)',
-        function(x) { return palette.linearRgbColor(0, x, x); });
-    add('Grayscale',
-        function(x) { return palette.rgbColor(x, x, x); });
-    add('Grayscale (linear)',
-        function(x) { return palette.linearRgbColor(x, x, x); });
+    add('Red', function(x) { return palette.rgbColor(x, 0, 0); });
+    add('Green', function(x) { return palette.rgbColor(0, x, 0); });
+    add('Blue', function(x) { return palette.rgbColor(0, 0, x); });
+    add('Yellow', function(x) { return palette.rgbColor(x, x, 0); });
+    add('Magenta', function(x) { return palette.rgbColor(x, 0, x); });
+    add('Cyan', function(x) { return palette.rgbColor(0, x, x); });
+    add('Grayscale', function(x) { return palette.rgbColor(x, x, x); });
 
     addHeading('Solarized palettes');
     add('Solarized base colours', 'sol-base');