restructured repo

source/python-flake/main.adoc0

@@ -1,4 +1,4 @@
-== A new flake from scratch (Python)
+= A new flake from scratch (Python)
 
 At last we are ready to create a flake from scratch! Start with an empty
 directory and create a git repository.
@@ -9,6 +9,8 @@ $ cd hello-python
 $ git init
 ....
 
+== A simple Python program
+
 Next, we’ll create a simple Python program.
 
 ////
@@ -57,6 +59,8 @@ $# nix-shell -p python3 --command sh
 $ python hello.py
 ....
 
+== A Python builder
+
 Next, create a Python script to build the package. We’ll use Python’s
 setuptools, but you can use other build tools. For more information on
 setuptools, see the
@@ -106,6 +110,8 @@ $# python -m build > /dev/null 2>&1
 
 After a lot of output messages, the build succeeds.
 
+== The Nix flake
+
 Now we should write `flake.nix`. We already know how to write most of
 the flake from the examples we did earlier. The two parts that will be
 different are the development shell and the package builder.