feat: add reading time (#6)

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### Tests

- [ ] My contribution adds new code, and I have added tests to cover it.
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Reviewed-on: #6
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

src/app/page.tsx

@@ -24,6 +24,7 @@ const Home = (): JSX.Element => {
           <h2><a className="underline" href={`/post/${post.slug}`}>{post.data.title}</a></h2>
           <p className="italic text-center">{post.data.date.toLocaleDateString("en-GB", { day: "numeric", month: "long", year: "numeric" })}</p>
           <p className="text-center">{post.data.summary}</p>
+          <p className="text-center">{`A ${post.data.readtime} read.`}</p>
         </div>;
       })}
     </main>