added note to readme

README.md

@@ -13,12 +13,16 @@ are comfortable with modifying `jinja2` templates and CSS, then you're in luck.
 
 **Note:** This project is in early development, there are no versioned releases
 yet, and breaking changes are likely. Versioned releases will be made and zona
-will be published to PyPI once it's stable.
+will be published to PyPI once it's stable. zona was previously implemented in
+Go; I decided to rewrite the project in Python. If you're interested in seeing
+the previous codebase (which is feature incomplete), visit the
+[~ficd/zona-go](https://git.sr.ht/~ficd/zona-go) repository.
 
 For an example of a website built with zona, please see
 [ficd.ca](https://ficd.ca).
 
 <!--toc:start-->
+
 - [Features](#features)
 - [Installation](#installation)
 - [Usage](#usage)
@@ -33,6 +37,7 @@ For an example of a website built with zona, please see
   - [Sitemap](#sitemap)
   - [Ignore List](#ignore-list)
   - [Drafts](#drafts)
+
 <!--toc:end-->
 
 ## Features