Add KaiOS icon (#984)

* Add the KaiOS logo SVG

Based on the contributions by @abenjamin765 in #976, but modified based on
some guidelines found here:
https://dribbble.com/shots/4931013-KaiOS-Brand-Guidelines/attachments/1105750

* Add KaiOS brand details

The be specific, as @abenjamin765 did not specify a source for the color
he used in #976, the color is taken from:
https://en.wikipedia.org/wiki/KaiOS#/media/File:KaiOS_logo.svg

_data/simple-icons.json

@@ -985,6 +985,11 @@
             "hex": "20BEFF",
             "source": "https://www.kaggle.com/contact"
         },
+        {
+            "title": "KaiOS",
+            "hex": "6F02B5",
+            "source": "https://www.dropbox.com/sh/2qihtgrzllws8ki/AABmo9X1KMT6lHnvh4Em7dpWa?dl=0"
+        },
         {
             "title": "Keybase",
             "hex": "33A0FF",

icons/kaios.svg

@@ -0,0 +1 @@
+<svg aria-labelledby="simpleicons-kaios-icon" role="img" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><title id="simpleicons-kaios-icon">KaiOS icon</title><path d="M4.47 0a2.81 2.81 0 0 0-2.84 2.78v18.43A2.8 2.8 0 0 0 4.47 24a2.8 2.8 0 0 0 2.85-2.78V2.78A2.83 2.83 0 0 0 4.47 0zm9.4 8.54a2.8 2.8 0 0 0-3.89-.66 2.68 2.68 0 0 0-.68 3.8l8 11.15a2.81 2.81 0 0 0 3.88.66 2.68 2.68 0 0 0 .74-3.72l-.06-.09-7.98-11.14zm3.65-1.18a3.71 3.71 0 0 0 3.74-3.67A3.71 3.71 0 0 0 17.52.02a3.71 3.71 0 0 0-3.75 3.67 3.71 3.71 0 0 0 3.75 3.67z"/></svg>