Pin benchmark colors (#3130)

I'd argue it's more important to easily see which lines are vortex vs
parquet vs other, than it is to distinguish between engines which can be
done on-hover. And 6 different colours is hard to mentally track.

Author: gatesn

benchmarks-website/code.js

@@ -5,12 +5,11 @@ window.initAndRender = (function () {
         const MAP = {
             "datafusion:arrow": '#7a27b1',
             "datafusion:parquet": '#ef7f1d',
-            "datafusionvortex": '#23d100',
-
-            "duckdb:parquet": '#ef1d24',
-            "duckdb:vortex": '#0062d1',
-            "duckdb:duckdb": '#000000',
+            "datafusion:vortex": '#19a508',
 
+            "duckdb:parquet": '#985113',
+            "duckdb:vortex": '#0e5e04',
+            "duckdb:duckdb": '#87752e',
         };
 
         if (MAP[str]) {