docs: convert to markdown with rst2myst

docs/source/cli.md

@@ -0,0 +1,18 @@
+# CLI Interface
+
+```{eval-rst}
+.. click:: main:cli
+   :nested: none
+   :prog: kupferbootstrap
+
+```
+
+## Commands
+
+% generated by cmd.rst
+
+```{toctree}
+:glob: true
+
+cli/*
+```