Generate sitemap.xml for JSON LD

Place all generated JSON-LD files in a directory on your visible server
- for example, name the directory "json" and place all of the .json files there (for MASPAWIO, you can grab the JSON-LD files from here)
Add a link to each of those JSON-LD files in your sitemap.xml
- the sitemap should appear something like:
```
  <?xml version="1.0" encoding="UTF-8"?>
  <urlset xmlns="https://www.sitemaps.org/schemas/sitemap/0.9">
    <url>
      <loc>http://maspawio.net/jsonld/maspawio_be4f43a4-7203-11e8-8dd7-0a735f7a740c.json</loc>
   </url>
   <url>
     <loc>http://maspawio.net/jsonld/maspawio_f217e79e-e427-11e9-8ad7-0a735f7a740c.json</loc>
   </url>
   ...
  </urlset>
```
- for example, here is a generated sitemap.xml for the MASPAWIO JSON-LD files: sitemap.xml
- to generate the sitemap links yourself, you can use the existing script: generate_sitemap.php
- see Google's help page for building sitemaps: https://developers.google.com/search/docs/advanced/sitemaps/build-sitemap
Submit your sitemap through the Google Search Console

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