Add hearthis.at icon (#8911)

_data/simple-icons.json

@@ -5287,6 +5287,11 @@
             "hex": "F47D31",
             "source": "https://www.headspace.com/press-and-media"
         },
+        {
+            "title": "hearthis.at",
+            "hex": "000000",
+            "source": "https://hearthis.at"
+        },
         {
             "title": "Hedera",
             "hex": "222222",

icons/hearthisdotat.svg

@@ -0,0 +1 @@
+<svg role="img" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><title>hearthis.at</title><path d="M20.485 3.515C15.799-1.17 8.2-1.17 3.515 3.515c-4.687 4.686-4.687 12.285 0 16.97 4.685 4.686 12.284 4.686 16.97 0 4.687-4.685 4.687-12.284 0-16.97zm-5.81 14.433c-.252.252-1.25.562-1.25-.012 0-.573-.157-3.089-2.028-4.958-1.88-1.88-4.55-2.192-5.056-2.192-.506 0-.331-1-.078-1.252.253-.253.558-.15 1.064-.15 0 0 3.445.464 5.326 2.345 1.868 1.869 2.173 5.153 2.173 5.153 0 .463.102.813-.15 1.066zm4.022-.509c-.36.36-1.786.803-1.786-.015 0-.82-.224-4.41-2.893-7.079C11.335 7.662 7.524 7.217 6.8 7.217c-.723 0-.473-1.426-.113-1.787.361-.36.799-.214 1.52-.214 0 0 4.918.663 7.603 3.348 2.666 2.667 3.1 7.356 3.1 7.356 0 .658.147 1.158-.214 1.52z"/></svg>