Add firebase and prepare for initial deploy

firebase.json

@@ -0,0 +1,53 @@
+{
+  "hosting": {
+    "public": "public",
+    "ignore": ["firebase.json", "**/.*", "**/node_modules/**"],
+    "headers": [
+      {
+        "source": "**/*",
+        "headers": [
+          {
+            "key": "cache-control",
+            "value": "cache-control: public, max-age=0, must-revalidate"
+          }
+        ]
+      },
+      {
+        "source": "static/**",
+        "headers": [
+          {
+            "key": "cache-control",
+            "value": "public, max-age=31536000, immutable"
+          }
+        ]
+      },
+      {
+        "source": "**/*.@(css|js)",
+        "headers": [
+          {
+            "key": "cache-control",
+            "value": "public, max-age=31536000, immutable"
+          }
+        ]
+      },
+      {
+        "source": "sw.js",
+        "headers": [
+          {
+            "key": "cache-control",
+            "value": "cache-control: public, max-age=0, must-revalidate"
+          }
+        ]
+      },
+      {
+        "source": "page-data/**",
+        "headers": [
+          {
+            "key": "cache-control",
+            "value": "cache-control: public, max-age=0, must-revalidate"
+          }
+        ]
+      }
+    ]
+  }
+}

src/pages/about.tsx

@@ -6,7 +6,7 @@ const AboutPage = () => (
   <Layout>
     <SEO title="About" />
     <p>
-      About
+      This is another Covid19 tracking website, because there aren&apos;t enough of those already.
     </p>
   </Layout>
 );