Update README

Author: davepeck

README.md

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 # html-tstring
 
+ARCHIVED. This package is no longer in active development.
+
+Instead, see the very actively developed [tdom](https://pypi.org/project/tdom/) package for a more powerful and flexible approach to HTML templating in Python.
+
+---
+
+PAST VERSIONS.
+
 A 🤘 rockin' t-string HTML templating system for Python 3.14.
 
 [![PyPI](https://img.shields.io/pypi/v/html-tstring.svg)](https://pypi.org/project/html-tstring/)