Add Smugmug icon (#1918)

* Add smugmug.svg

* Add SmugMug data

* Update SmugMug colour

_data/simple-icons.json

@@ -3281,6 +3281,11 @@
             "hex": "E85C33",
             "source": "https://www.smashingmagazine.com/"
         },
+        {
+            "title": "SmugMug",
+            "hex": "6DB944",
+            "source": "https://help.smugmug.com/using-smugmug's-logo-HJulJePkEBf"
+        },
         {
             "title": "Snapchat",
             "hex": "FFFC00",

icons/smugmug.svg

@@ -0,0 +1 @@
+<svg role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><title>SmugMug icon</title><path d="M18.31 0l-.35.01c-1.55.13-2.46 1.2-2.6 2.28-.15 1.2.65 2.4 2.58 2.28 2.15-.12 3.09-1.2 3.1-2.28.02-1.15-1-2.28-2.73-2.29zM7.21.34A2.66 2.66 0 004.56 2.6C4.41 3.73 5.12 4.87 7 4.85c2.23-.04 3.31-1.37 3.16-2.57-.12-1-1.09-1.92-2.94-1.94zm12.35 8.71a7 7 0 00-.4.02c-5.28.54-5.54.6-15.26.82C-.2 9.9.62 24 9.38 24c8.2 0 18.12-15.15 10.18-14.95zm-1.1 2.7c3.18-.07-2.9 9.53-8.8 9.56-7.46 0-6.44-8.8-5.18-8.85 8.67-.35 10.88-.64 13.98-.71Z"/></svg>