Add Unlicense icon (#7543)

* Add Unlicense logo

* Redo unlicense svg

* Update icons/unlicense.svg

Co-authored-by: Sigurd Spieckermann <2206639+sisp@users.noreply.github.com>

* Change Unlicense color

* Update simple-icons.json

* Update simple-icons.json

Co-authored-by: Sigurd Spieckermann <2206639+sisp@users.noreply.github.com>

_data/simple-icons.json

@@ -11289,6 +11289,11 @@
             "source": "https://brand.unity.com/",
             "guidelines": "https://brand.unity.com/"
         },
+        {
+            "title": "Unlicense",
+            "hex": "808080",
+            "source": "https://commons.wikimedia.org/wiki/File:PD-icon.svg"
+        },
         {
             "title": "UnoCSS",
             "hex": "333333",

icons/unlicense.svg

@@ -0,0 +1 @@
+<svg role="img" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><title>Unlicense</title><path d="M24 12c0 6.627-5.373 12-12 12S0 18.627 0 12 5.373 0 12 0s12 5.373 12 12ZM12 2.449A9.551 9.551 0 0 0 2.449 12c0 2.09.672 4.024 1.811 5.597L17.597 4.26A9.508 9.508 0 0 0 12 2.449Zm0 19.102A9.551 9.551 0 0 0 21.551 12c0-2.09-.672-4.024-1.811-5.597L6.403 19.74A9.508 9.508 0 0 0 12 21.551Zm0-2.816a6.704 6.704 0 0 1-3.34-.885l2.32-2.32a3.674 3.674 0 0 0 4.388-2.06h3.206A6.737 6.737 0 0 1 12 18.734ZM5.265 12A6.735 6.735 0 0 1 15.34 6.15l-2.32 2.32a3.673 3.673 0 0 0-4.55 4.55l-2.32 2.32A6.704 6.704 0 0 1 5.265 12Zm13.28-1.592h-2.443L17.85 8.66c.309.54.545 1.128.695 1.748Z"/></svg>