docs: use markdown for readme file

README.md

@@ -1,6 +1,5 @@
 
-tailbone-theo
-=============
+# tailbone-theo
 
 This is an experimental project, as of this writing.  Its purpose is 2-fold:
 
@@ -10,6 +9,4 @@ This is an experimental project, as of this writing.  Its purpose is 2-fold:
 This may also attempt certain aspects of "curbside" and/or "delivery" orders at
 some point, we'll see.  Nobody should be holding their breath maybe.
 
-See the `Rattail Project`_ for more info.
-
-.. _`Rattail Project`: https://rattailproject.org/
+See the [Rattail Project](https://rattailproject.org/) for more info.

pyproject.toml

@@ -8,7 +8,7 @@ build-backend = "hatchling.build"
 name = "tailbone-theo"
 version = "0.2.3"
 description = "Theo, the order system"
-readme = "README.rst"
+readme = "README.md"
 authors = [{name = "Lance Edgar", email = "lance@edbob.org"}]
 license = {text = "GNU GPL v3+"}
 classifiers = [