Move the old site to another repo (#5739)

* Delete the old site from this repo

* Remove old GH workflow

* Remove other files

scripts/generateHeadingIDs.js

@@ -1,79 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- */
-
-const fs = require('fs');
-const GithubSlugger = require('github-slugger');
-
-function walk(dir) {
-  let results = [];
-  const list = fs.readdirSync(dir);
-  list.forEach(function(file) {
-    file = dir + '/' + file;
-    const stat = fs.statSync(file);
-    if (stat && stat.isDirectory()) {
-      /* Recurse into a subdirectory */
-      results = results.concat(walk(file));
-    } else {
-      /* Is a file */
-      results.push(file);
-    }
-  });
-  return results;
-}
-
-function stripLinks(line) {
-  return line.replace(/\[([^\]]+)\]\([^)]+\)/, (match, p1) => p1);
-}
-
-function addHeaderID(line, slugger) {
-  // check if we're a header at all
-  if (!line.startsWith('#')) {
-    return line;
-  }
-  // check if it already has an id
-  if (/\{#[^}]+\}/.test(line)) {
-    return line;
-  }
-  const headingText = line.slice(line.indexOf(' ')).trim();
-  const headingLevel = line.slice(0, line.indexOf(' '));
-  return `${headingLevel} ${headingText} {#${slugger.slug(
-    stripLinks(headingText),
-  )}}`;
-}
-
-function addHeaderIDs(lines) {
-  // Sluggers should be per file
-  const slugger = new GithubSlugger();
-  let inCode = false;
-  const results = [];
-  lines.forEach(line => {
-    // Ignore code blocks
-    if (line.startsWith('```')) {
-      inCode = !inCode;
-      results.push(line);
-      return;
-    }
-    if (inCode) {
-      results.push(line);
-      return;
-    }
-
-    results.push(addHeaderID(line, slugger));
-  });
-  return results;
-}
-
-const [path] = process.argv.slice(2);
-
-const files = walk(path);
-files.forEach(file => {
-  if (!file.endsWith('.md')) {
-    return;
-  }
-
-  const content = fs.readFileSync(file, 'utf8');
-  const lines = content.split('\n');
-  const updatedLines = addHeaderIDs(lines);
-  fs.writeFileSync(file, updatedLines.join('\n'));
-});