package with hatchling and switch to toml

Author: Remi-Gau

.flake8

@@ -0,0 +1,4 @@
+[flake8]
+max-line-length = 88
+extend-ignore = E203
+exclude = neurodocker/_version.py

.gitignore

@@ -1,6 +1,9 @@
 # MACOS related
 .DS_Store
 
+# hatchling autogenerates it on install
+neurodocker/_version.py
+
 # Byte-compiled / optimized / DLL files
 __pycache__/
 *.py[cod]