Add Wikibooks icon (#11924)

_data/simple-icons.json

@@ -17737,6 +17737,11 @@
             "hex": "1976D2",
             "source": "https://cdn.js.wiki/images/wikijs-butterfly-mono.svg"
         },
+        {
+            "title": "Wikibooks",
+            "hex": "006699",
+            "source": "https://commons.wikimedia.org/wiki/File:Wikibooks-logo-white.svg"
+        },
         {
             "title": "Wikidata",
             "hex": "006699",

icons/wikibooks.svg

@@ -0,0 +1 @@
+<svg role="img" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><title>Wikibooks</title><path d="M6.027.29c-.424.143-.776.418-1.106.707C.434 5.314.254 5.497.254 5.497c-.236.22-.257.537-.254.859l.021 1.819s2.07-2.013 5.164-4.99c1.665 4.337 3.405 8.651 5.116 12.974.234.653-.329 1.188-1.04 1.902-.982.958-3.034 2.93-5.136 5.561h2.107l5.067-5.554c.482-.662 1.077-1.309.824-1.909L8.145 5.806c.924-.785 1.763-1.676 2.618-2.531l5.252 13.173c.303.891-.175 1.684-1.134 2.549-1.148.922-3.508 3.073-4.58 4.712h1.631c1.71-1.758 2.017-1.994 3.964-3.68 1.308-1.334 2.488-2.022 1.871-3.731l-4.13-10.325c1.007-.99 2.013-1.875 2.98-2.852 2.113 4.643 3.559 8.384 5.33 13.33.58 1.607.458 1.682-.928 2.55-2.228 1.107-2.929 1.834-5.585 4.66h1.815c2.22-2.008 3.045-2.716 5.825-4.18.983-.569 1.116-1.285.713-2.4-1.3-3.616-4.116-11.41-6.719-16.755l-4.103 3.971-1.569-3.92C9.912 1.38 8.74 2.78 7.466 4.04z"/></svg>