Update GitHub logo

Normalise SVG and add mix-blend-mode:difference for dark/light mode

assets/custom-icons/_data/custom-icons.json

@@ -54,8 +54,7 @@
       "title": "Firefox"
     },
     {
-      "title": "Github",
-      "hex": "858585"
+      "title": "GitHub"
     },
     {
       "title": "Google"

assets/custom-icons/icons/github.svg

@@ -1 +1,5 @@
-<svg role="img" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><title>GitHub</title><path d="M12 .297c-6.63 0-12 5.373-12 12 0 5.303 3.438 9.8 8.205 11.385.6.113.82-.258.82-.577 0-.285-.01-1.04-.015-2.04-3.338.724-4.042-1.61-4.042-1.61C4.422 18.07 3.633 17.7 3.633 17.7c-1.087-.744.084-.729.084-.729 1.205.084 1.838 1.236 1.838 1.236 1.07 1.835 2.809 1.305 3.495.998.108-.776.417-1.305.76-1.605-2.665-.3-5.466-1.332-5.466-5.93 0-1.31.465-2.38 1.235-3.22-.135-.303-.54-1.523.105-3.176 0 0 1.005-.322 3.3 1.23.96-.267 1.98-.399 3-.405 1.02.006 2.04.138 3 .405 2.28-1.552 3.285-1.23 3.285-1.23.645 1.653.24 2.873.12 3.176.765.84 1.23 1.91 1.23 3.22 0 4.61-2.805 5.625-5.475 5.92.42.36.81 1.096.81 2.22 0 1.606-.015 2.896-.015 3.286 0 .315.21.69.825.57C20.565 22.092 24 17.592 24 12.297c0-6.627-5.373-12-12-12"/></svg>
+<svg width="500" height="500" viewBox="0 0 500 500" fill="none" xmlns="http://www.w3.org/2000/svg">
+<g style="mix-blend-mode:difference">
+<path fill-rule="evenodd" clip-rule="evenodd" d="M250.207 5C111.849 5 0 117.52 0 256.723C0 367.996 71.6655 462.186 171.084 495.522C183.514 498.028 188.067 490.106 188.067 483.442C188.067 477.606 187.658 457.603 187.658 436.761C118.056 451.767 103.562 406.754 103.562 406.754C92.3769 377.581 75.8037 370.083 75.8037 370.083C53.0231 354.662 77.463 354.662 77.463 354.662C102.733 356.329 115.992 380.501 115.992 380.501C138.358 418.84 174.398 408.007 188.897 401.338C190.966 385.084 197.599 373.832 204.641 367.582C149.128 361.746 90.7227 340.075 90.7227 243.385C90.7227 215.879 100.658 193.374 116.402 175.872C113.918 169.622 105.217 143.779 118.891 109.189C118.891 109.189 140.017 102.519 187.653 135.028C208.047 129.517 229.079 126.714 250.207 126.691C271.333 126.691 292.869 129.611 312.756 135.028C360.396 102.519 381.523 109.189 381.523 109.189C395.197 143.779 386.491 169.622 384.007 175.872C400.165 193.374 409.691 215.879 409.691 243.385C409.691 340.075 351.285 361.326 295.358 367.582C304.474 375.499 312.341 390.5 312.341 414.257C312.341 448.013 311.931 475.105 311.931 483.437C311.931 490.106 316.49 498.028 328.914 495.527C428.333 462.18 499.999 367.996 499.999 256.723C500.409 117.52 388.15 5 250.207 5Z" fill="white"/>
+</g>
+</svg>