feat: set og:type to article for posts (#183)

* New prop setOGTypeArticle sets og:type to "article" for posts, and "website" for every other page.

* Fixed error where I declared setOGTypeArticle twice.

src/layouts/Layout.astro

@@ -22,9 +22,10 @@ interface Props {
   banner?: string
   description?: string
   lang?: string
+  setOGTypeArticle?: boolean
 }
 
-let { title, banner, description, lang } = Astro.props
+let { title, banner, description, lang, setOGTypeArticle } = Astro.props
 
 // apply a class to the body element to decide the height of the banner, only used for initial page load
 // Swup can update the body for each page visit, but it's after the page transition, causing a delay for banner height change
@@ -82,6 +83,11 @@ const bannerOffset = bannerOffsetByPosition[siteConfig.banner.position || 'cente
 		<meta property="og:url" content={Astro.url}>
 		<meta property="og:title" content={pageTitle}>
 		<meta property="og:description" content={description || pageTitle}>
+		{setOGTypeArticle ? (
+        <meta property="og:type" content="article" />
+        ) : (
+        <meta property="og:type" content="website" />
+        )}
 
 		<meta name="twitter:card" content="summary_large_image">
 		<meta property="twitter:url" content={Astro.url}>