Add svgo (#672)

.svgo.config.js

@@ -0,0 +1,43 @@
+/**
+ * SVGO Configuration
+ * Compatible to v3.0.0+
+ * Recommended options from:
+ * https://www.mediawiki.org/wiki/Manual:Coding_conventions/SVG#Exemplified_safe_configuration
+ */
+
+'use strict';
+
+module.exports = {
+	plugins: [
+		{
+			// Set of built-in plugins enabled by default.
+			name: 'preset-default',
+			params: {
+				overrides: {
+					cleanupIds: false,
+					removeDesc: false,
+					removeTitle: false,
+					removeViewBox: false,
+					// If the SVG doesn't start with an XML declaration, then its MIME type will
+					// be detected as "text/plain" rather than "image/svg+xml" by libmagic and,
+					// consequently, MediaWiki's CSSMin CSS minifier. libmagic's default database
+					// currently requires that SVGs contain an XML declaration:
+					// https://github.com/threatstack/libmagic/blob/master/magic/Magdir/sgml#L5
+					removeXMLProcInst: false
+				}
+			}
+		},
+		'removeRasterImages',
+		'sortAttrs'
+	],
+	// Set whitespace according to Wikimedia Coding Conventions.
+	// @see https://github.com/svg/svgo/blob/main/lib/stringifier.js#L39 for available options.
+	js2svg: {
+		eol: 'lf',
+		finalNewline: true,
+		// Configure the indent to tabs (default 4 spaces) used by `--pretty` here.
+		indent: '\t',
+		pretty: true
+	},
+	multipass: true
+};