Update the README with the info I want it to have

README.md

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 # v6.chriskrycho.com
 
 > **Note**: Under construction! 👷🏻‍♂️ 🚧 The current version of my website is [v5.chriskrycho.com](https://v5.chriskrycho.com). This will change before it goes live. A *lot*.
+
+## Previous versions
+
+- [v1.chriskrycho.com][v1]—my Blogger blog as it was from 2006–2011, originally at `blog.chriskrycho.com`, but I decided I wanted that domain available to redirect to whatever is my current *blog* site.
+- [v2.chriskrycho.com][v2]—a simple site that I used as a portfolio and for some experimentation in 2011.
+- [v3.chriskrycho.com][v3]—a family of [WordPress] sites, where I ran my various blogging from 2012–2013.
+- [v4.chriskrycho.com][v4]—a statically-generated site built with [Pelican], from 2014–2018.
+
+## Current version
+
+[v5.chriskrycho.com][v5]—a statically-generated site built with [11ty][11ty], from 2019–20??.
+
+[v1]: https://v1.chriskrycho.com
+[v2]: https://v2.chriskrycho.com
+[v3]: https://v3.chriskrycho.com
+[v4]: https://v4.chriskrycho.com
+[v5]: https://v5.chriskrycho.com
+
+[Pelican]: https://github.com/getpelican/pelican
+[WordPress]: https://wordpress.org
+[11ty]: https://www.11ty.dev