chore(blame): allow linting commit to be ignored when using git blame

.git-blame-ignore-revs

+# ignore changes applied via flake8 and black
+f029e56e71fe28e5039f52a654743c76d386e07d

README.md

@@ -34,6 +34,15 @@ docker-compose up --build
 
 The local documentation is now available at <http://localhost:8000/>.
 
+### Configuring git to ignore bulk source formatting changes
+
+To ignore the bulk formatting changes introduced by the additional of `black` and `flake8`
+a `.git-blame-ignore-revs` has been added with the commit SHAs to ignore. To use:
+
+```text
+git config blame.ignoreRevsFile .git-blame-ignore-revs
+```
+
 ### Adding a page
 
 1. Create a Markdown file in the relevant directory under `docs`.