Merge pull request #38 from tatsutakein-jp/feature/GH-37

feat: ogp などの情報を追加

public/robots.txt

@@ -0,0 +1,4 @@
+User-agent: *
+Allow: /
+
+Sitemap: https://asis.quest/sitemap-index.xml

src/components/MainHead.astro

@@ -7,16 +7,28 @@ interface Props {
 }
 
 const { title = 'ASIS', description = 'The quest to live life as it is' } = Astro.props
+
+const canonicalURL = new URL(Astro.url.pathname, Astro.site)
+const socialImageURL = new URL('/ogp.png', Astro.url)
 ---
 
 <meta charset="UTF-8"/>
-<meta name="description" property="og:description" content={description}/>
+<meta name="description" content={description}/>
 <meta name="viewport" content="width=device-width"/>
 <link rel="sitemap" href="/sitemap-index.xml" />
 <meta name="generator" content={Astro.generator}/>
 <title>{title}</title>
 
 <link rel="icon" type="image/svg+xml" href="/favicon.svg"/>
+<link rel="canonical" href={canonicalURL} />
+<meta property="og:title" content={title} />
+<meta property="og:type" content="website" />
+<meta property="og:image" content={socialImageURL} />
+<meta property="og:url" content={canonicalURL} />
+<meta property="og:description" content={description} />
+<meta property="og:site_name" content="ASIS" />
+<meta name="twitter:card" content="summary_large_image" />
+
 <link rel="preconnect" href="https://fonts.googleapis.com"/>
 <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin/>
 <link