update Facebook to 2019 branding (#212)

images/reference/facebook.svg

@@ -1,92 +1,16 @@
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-   height="94.153999mm"
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+	 viewBox="0 0 1024 1024" style="enable-background:new 0 0 1024 1024;" xml:space="preserve">
+<style type="text/css">
+	.st0{fill:#1877F2;}
+	.st1{fill:#FFFFFF;}
+</style>
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 </svg>

images/svg/facebook.svg

@@ -3,4 +3,4 @@ aria-label="Facebook" role="img"
 viewBox="0 0 512 512"><rect
 width="512" height="512"
 rx="15%"
-fill="#3b5998"/><path fill="#fff" d="M330 512V322h64l9-74h-73v-47c0-22 6-36 37-36h39V99c-7-1-30-3-57-3-57 0-95 34-95 98v54h-64v74h64v190z"/></svg>
+fill="#1877f2"/><path d="M355.6 330l11.4-74h-71v-48c0-20.2 9.9-40 41.7-40H370v-63s-29.3-5-57.3-5c-58.5 0-96.7 35.4-96.7 99.6V256h-65v74h65v182h80V330h59.6z" fill="#fff"/></svg>