Add README badges (#26)

* Remove old config files for Gitpod and Readthedocs.

* Update license year.

* Remove build and publish targets (now using Actions).

* Poetry update.

* Add badges and remove old demo from README.

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2023 Matthew Henderson
+Copyright (c) 2024 Matthew Henderson
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

Makefile

@@ -4,8 +4,3 @@ install:
 test:
 	poetry run pytest
 
-build:
-	poetry build
-
-publish:
-	poetry publish

README.md

@@ -1,21 +1,8 @@
-# listcolouring
-List colouring in Python with NetworkX.
-
-```python
-import networkx as nx
-import matplotlib.pyplot as plt
+[![PyPI version](https://badge.fury.io/py/listcolouring.svg)](https://badge.fury.io/py/listcolouring)
+![python package](https://github.com/MHenderson/listcolouring/actions/workflows/python-package.yml/badge.svg)
+![python publish](https://github.com/MHenderson/listcolouring/actions/workflows/python-publish.yml/badge.svg)
 
-import listcolouring
-from listcolouring import list_init, greedy_list_edge_colouring, print_list_edge_colouring
-
-G = nx.petersen_graph()
+# listcolouring
 
-G = list_init(G, range(0, 10), 3, 0)
-G = greedy_list_edge_colouring(G)
-
-options = {'with_labels': True, 'node_color': "white"}
-colors = nx.get_edge_attributes(G,'colour').values()
-nx.draw_shell(G, nlist = [range(5, 10), range(5)], edge_color = colors, **options)
+List colouring of graphs in Python.
 
-plt.savefig("img/petersen-shell.png", format = "PNG"
-```