Merge pull request #478 from beeminder/update-to-unique-blog-favicon

update blog favicon

public/manifest.webmanifest

@@ -0,0 +1,6 @@
+{
+    "icons": [
+        {"src": "/icon-192.png", "type": "image/png", "sizes": "192x192"},
+        {"src": "/icon-512.png", "type": "image/png", "sizes": "512x512"}
+    ]
+}

src/layouts/Layout.astro

@@ -56,7 +56,8 @@ const canonicalUrl = new URL(Astro.url.pathname, Astro.site);
 
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width" />
-    <link rel="icon" type="image/png" href="/favicon.png" />
+    <link rel="icon" type="image/png" href="/favicon.ico" />
+    <link rel="manifest" href="/manifest.webmanifest" />
     <meta name="generator" content={Astro.generator} />
 
     <title set:html={`${title} | Beeminder Blog`} />

src/lib/__snapshots__/getPosts.spec-snapshot.ts.snap

@@ -4860,7 +4860,7 @@ Yay incentives!
 "
 `;
 
-exports[`body > post astroblog hash f214b52e8804417aa13a661edf7e99c0 1`] = `
+exports[`body > post astroblog hash 2cb564f0bd8c34a3eba61786b84c0b7b 1`] = `
 "
 <p>
   <img
@@ -68012,7 +68012,7 @@ But don&#8217;t listen to me, see what a true
 "
 `;
 
-exports[`body > post predict hash 1c0bdd2bcebb1e1c91531bb0bce392d0 1`] = `
+exports[`body > post predict hash b9ed963e091616cadde1b4326a1ba560 1`] = `
 "
 <p>
   <img
@@ -72186,7 +72186,7 @@ See especially the case of Pact, whose scheme of paying successful users we&#821
 "
 `;
 
-exports[`body > post readwise hash cfc7dd19133c9cf22f76789324c48ebf 1`] = `
+exports[`body > post readwise hash df9779ab68a4458e6036baf279071d00 1`] = `
 "
 <p>
   <img