Migration script fixes (#138)

* Remove non-functional `pipx` example

* Fix .flake typo

README.md

@@ -60,12 +60,6 @@ To compare dist files with a reference checkout, run the following:
 python -m hatch_jupyter_builder.compare_migration <source_dir> <target_dir> sdist
 ```
 
-The migration scripts can also be used without installation, using `pipx`, e.g.:
-
-```bash
-pipx hatch_jupyter_builder migrate .
-```
-
 Use `wheel` to compare wheel file contents.
 
 See the [documentation for more information on migration](https://hatch-jupyter-builder.readthedocs.io/en/latest/source/how_to_guides/index.html) for more details.

hatch_jupyter_builder/migrate/_migrate.py

@@ -79,6 +79,7 @@
 # Move flake8 config to separate file, preserving comments.
 # Add .flake8 file to git.
 setup_cfg = Path("setup.cfg")
+flake8_path = Path(".flake8")
 flake8 = ["[flake8]"]
 if setup_cfg.exists():
     lines = setup_cfg.read_text("utf-8").splitlines()
@@ -97,8 +98,8 @@
         flake8.append(line)
 
     if matches:
-        Path(".flake8").write_text("\n".join(flake8) + "\n", "utf-8")
-        subprocess.run(["git", "add", ".flake"], check=False)
+        flake8_path.write_text("\n".join(flake8) + "\n", "utf-8")
+        subprocess.run(["git", "add", str(flake8_path)], check=False)
 
 
 # Migrate and remove unused config.