Add posts and old grade-calc

Fix small bugs
>bad commit

pages/posts/[page].tsx

@@ -0,0 +1,42 @@
+import Layout from '../../components/layout';
+import { useRouter } from 'next/router';
+import { getAllPosts, getPost } from '../../lib/slug';
+import ReactMarkdown from 'react-markdown';
+import Image from 'next/image';
+
+function Post({post} : any) { // eh
+    const router = useRouter();
+    return (
+        <Layout name={post.title} title={post.title} ancestors={[{name:'Posts', path: 'posts'}]}>
+            <section className='block'>
+                {post.cover ? <Image width={640} height={360} layout="intrinsic" src={`/assets/images/${post.cover}`} alt={`${post.title} Cover Image`} /> : ''}
+                <ReactMarkdown>{post.content}</ReactMarkdown>
+            </section>
+        </Layout>
+    );
+}
+
+export async function getStaticProps({params}: any) {
+    const post = getPost(params.page);
+
+    return {
+        props: {post}
+    };
+}
+
+export async function getStaticPaths() {
+    const posts = getAllPosts();
+    return {
+        paths: posts.map(post => {
+            return {
+                params: {
+                    page: post.slug
+                }
+            }
+        }),
+        fallback: false
+    };
+}
+
+
+export default Post;

pages/posts/index.tsx

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+import Link from 'next/link';
+import React from 'react';
+import Layout from '../../components/layout';
+import { getAllPosts } from '../../lib/slug';
+import Pages from '../../public/pages.json';
+import cachePostLinkData from '../../util/post-cache';
+
+
+function HomePage({posts}: any) {
+    Pages.sort((x, y) => { return ('' + x.title).localeCompare(y.title) });
+    return (
+        <Layout name='Posts'>
+            {posts.map((post: any) => {
+                return <section key='' className='h5 block'>
+                    <Link href={`posts/${post.slug}`}>
+                        {post.title}
+                    </Link>
+                    <div>[{ (new Date(post.last_updated)).toLocaleString()}]</div>
+                </section>
+            })}
+        </Layout>
+    )
+}
+
+export async function getStaticProps() {
+
+    return {
+        props: {posts: cachePostLinkData()}
+    };
+}
+
+export default HomePage;