feat(plugin): extract repeated markup

closes #2

.eleventy.js

@@ -1,24 +1,27 @@
 const SERVICE_BASE = `https://t1.gstatic.com/faviconV2?client=SOCIAL&type=FAVICON&fallback_opts=TYPE,SIZE,URL&url=%%URL%%&size=%%SIZE%%`
 
+const applyTemplate = (text, href, size) => {
+	return `<a href="${href}"><img alt="favicon for ${href}" loading="lazy" style="max-height: 1em; position: relative; top: .2em; margin-right: .2em" src="${SERVICE_BASE.replace(
+		"%%URL%%",
+		href
+	).replace("%%SIZE%%", size)}"/>${text}</a>`
+}
+
 module.exports = (eleventyConfig, options) => {
 	const defaults = {
 		size: 128,
 	}
 
-	eleventyConfig.addPairedShortcode("ai", function (content, href, size = 128) {
-		return `<a  href="${href}"><img alt="favicon for ${href}" loading="lazy" style="max-height: 1em; position: relative; top: .2em; margin-right: .2em" src="${SERVICE_BASE.replace("%%URL%%", href).replace("%%SIZE%%", size)}"/>${content}</a>`
+	eleventyConfig.addPairedShortcode("ai", function (text, href, size = 128) {
+		return applyTemplate(text, href, size)
 	})
 
 	eleventyConfig.addFilter("ai", (href, text) => {
 		const { size } = {
 			...defaults,
 			...options,
 		}
-
-		return `<a href="${href}"><img alt="favicon for ${href}" loading="lazy" style="max-height: 1em; position: relative; top: .2em; margin-right: .2em" src="${SERVICE_BASE.replace(
-			"%%URL%%",
-			href
-		).replace("%%SIZE%%", size)}"/>${text}</a>`
+		return applyTemplate(text, href, size)
 	})
 	return {
 		markdownTemplateEngine: "njk",