Add posts and old grade-calc

Fix small bugs
>bad commit

pages/index.tsx

@@ -2,29 +2,46 @@ import Link from 'next/link';
 import React from 'react';
 import Layout from '../components/layout';
 import Pages from '../public/pages.json';
+import cachePostLinkData from '../util/post-cache';
 
-// import { GetStaticProps } from 'next';
 
-function HomePage() {
+function HomePage({posts}: any) {
+    Pages.sort((x, y) => { return ('' + x.title).localeCompare(y.title) });
     return (
         <Layout name='' title='PaulW.XYZ'>
-            <section className='block' style={{ textAlign: 'center' }}>
-                <div className='h2'>Welcome to my website!</div>                {
+            <section className='block'>
+                <div className='h2'>Welcome!</div>
+                {
                     Pages.map(obj => {
-                        return <div key='' className='h3'>
+                        return <div key='' className='h5'>
                             <Link href={obj.link}>
-                                <a>{obj.title}</a>
+                                <a>{obj.title}{obj.link.match('^http*')? ' ↗' : ''}</a>
                             </Link>
                         </div>
                     })
                 }
             </section>
+            <section className='block'>
+                <div className='h2'>Posts</div>
+                <div>
+                    {posts?.map((post: any) => {
+                        return <div key={post.slug} className='h5'>
+                            [{ (new Date(post.last_updated)).toLocaleString()}] <Link href={`posts/${post.slug}`}>
+                                {post.title}
+                            </Link>
+                        </div>
+                    })}
+                </div>
+            </section>
         </Layout>
     )
 }
 
-export default HomePage;
+export async function getStaticProps() {
+    // make this webpack plugin
+    return {
+        props: {posts: cachePostLinkData()} 
+    };
+}
 
-// export async function getStaticProps(context): GetStaticProps {
-
-// }
+export default HomePage;