Use Highlight.php instead of Prism.js for server-side rendering of Code block's syntax highlighting

.eslintrc.js

@@ -0,0 +1,22 @@
+module.exports = {
+	root: true,
+	extends: [
+		'wordpress'
+	],
+	env: {
+		browser: false,
+		node: true
+	},
+	parserOptions: {
+		sourceType: 'module',
+		ecmaVersion: 2018,
+		ecmaFeatures: {
+			jsx: true
+		}
+	},
+	settings: {
+		react: {
+			pragma: 'wp'
+		}
+	}
+};

.gitignore

@@ -5,4 +5,26 @@ node_modules
 npm-debug.log
 yarn-error.log
 yarn.lock
-pacakge-lock.json
+package-lock.json
+/vendor/*
+!/vendor/scrivo
+/vendor/scrivo/highlight.php/*
+
+!/vendor/scrivo/highlight.php/Highlight/
+/vendor/scrivo/highlight.php/Highlight/languages/*.json
+!/vendor/scrivo/highlight.php/Highlight/languages/bash.json
+!/vendor/scrivo/highlight.php/Highlight/languages/cpp.json # Like clike.
+!/vendor/scrivo/highlight.php/Highlight/languages/css.json
+!/vendor/scrivo/highlight.php/Highlight/languages/diff.json # Can be used instead of 'git' in Prism.
+!/vendor/scrivo/highlight.php/Highlight/languages/go.json
+!/vendor/scrivo/highlight.php/Highlight/languages/javascript.json # Also jsx.
+!/vendor/scrivo/highlight.php/Highlight/languages/json.json
+!/vendor/scrivo/highlight.php/Highlight/languages/markdown.json
+!/vendor/scrivo/highlight.php/Highlight/languages/php.json
+!/vendor/scrivo/highlight.php/Highlight/languages/python.json
+!/vendor/scrivo/highlight.php/Highlight/languages/sql.json
+!/vendor/scrivo/highlight.php/Highlight/languages/xml.json # Also markup/HTML.
+
+!/vendor/scrivo/highlight.php/styles/
+/vendor/scrivo/highlight.php/styles/*
+!/vendor/scrivo/highlight.php/styles/default.css