Release version

Prepare the package for release. A non-exhaustive list of tasks includes:

• make documentation
• prepare examples and tutorials
• make the package installable
• fix randomly failing tests

and likely many other things that I fail to recall now.

docs/environment.yml

+name: pymf-docs
+
+channels:
+  - conda-forge
+
+dependencies:
+  - python=3.11
+  - kwant
+  - myst-nb
+  - numpy
+  - scipy
+  - matplotlib-base
+  - sphinx-togglebutton
+  - sphinx-copybutton
+  - pip
+  - git
+  - make
+  - pip:
+    - sphinx-book-theme>=1.1.0
+    - sphinx-tippy
+    - ..