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/MainGridLayout.astro

@@ -12,15 +12,16 @@ interface Props {
   banner?: string
   description?: string
   lang?: string
+  setOGTypeArticle?: boolean;
 }
 
-const { title, banner, description, lang } = Astro.props
+const { title, banner, description, lang, setOGTypeArticle } = Astro.props
 const hasBannerCredit =
   siteConfig.banner.enable && siteConfig.banner.credit.enable
 const hasBannerLink = !!siteConfig.banner.credit.url
 ---
 
-<Layout title={title} banner={banner} description={description} lang={lang}>
+<Layout title={title} banner={banner} description={description} lang={lang} setOGTypeArticle={setOGTypeArticle}>
 <slot slot="head" name="head"></slot>
 <div id="top-row" class="z-50 pointer-events-none relative transition-all duration-700 max-w-[var(--page-width)] px-0 md:px-4 mx-auto" class:list={[""]}>
     <div id="navbar-wrapper" class="pointer-events-auto sticky top-0 transition-all">