Migrating blog.rymcg.tech into book.rymcg.tech

I am moving the older blog.rymcg.tech posts into the book.rymcg.tech site.

The old blog URLs will keep working, and their permalinks will be carried over to the new site structure. The goal is to keep the published paths stable while consolidating the content into one Hugo/Org project.

I have not yet switched DNS over to the new site. That will happen in a phased rollout.

The source repository is available at github.com/EnigmaCurry/org.