Add code snippets(temporary)

sites/svelte.dev/src/lib/server/docs/index.js

@@ -19,8 +19,9 @@ const base = '../../site/content/docs/';
 const languages = {
 	bash: 'bash',
 	env: 'bash',
-	html: 'markup',
+	html: 'html',
 	svelte: 'svelte',
+	sv: 'svelte',
 	js: 'javascript',
 	css: 'css',
 	diff: 'diff',
@@ -86,6 +87,9 @@ export async function read_file(file) {
 				version_class = 'js-version';
 			}
 
+			// TODO: Replace later
+			html = highlighter.codeToHtml(source, { lang: languages[language] });
+
 			// if (language === 'dts') {
 			// 	// @ts-ignore
 			// 	html = renderCodeToHTML(source, 'ts', { twoslash: false }, {}, highlighter);