Add Scala icon (#1001)

* Add Scala icon

Vectorized the flat PNG found in the header at the scala homepage:
https://www.scala-lang.org/

* Add Scala icon details

Add Scala to the data file. The color is extracted from the hovered
styling of the links in the header (`nav > ul > li > a:hover`).

* Update Scala icon SVG

Co-authored-by: Johan Fagerberg <johanringmann@gmail.com>

_data/simple-icons.json

@@ -1725,6 +1725,11 @@
             "hex": "E2231A",
             "source": "https://saucelabs.com/"
         },
+        {
+            "title": "Scala",
+            "hex": "DC322F",
+            "source": "https://www.scala-lang.org/"
+        },
         {
             "title": "Scribd",
             "hex": "1A7BBA",

icons/scala.svg

@@ -0,0 +1 @@
+<svg aria-labelledby="simpleicons-scala-icon" role="img" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><title id="simpleicons-scala-icon">Scala icon</title><path d="M4.589 24c4.537 0 13.81-1.516 14.821-3v-5.729c-.957 1.408-10.284 2.912-14.821 2.912V24zM4.589 16.365c4.537 0 13.81-1.516 14.821-3V7.636c-.957 1.408-10.284 2.912-14.821 2.912v5.817zM4.589 8.729c4.537 0 13.81-1.516 14.821-3V0C18.453 1.408 9.126 2.912 4.589 2.912v5.817z"/></svg>