Update README and workflows

Author: benjimaclellan

.github/workflows/autoblack.yml

@@ -1,6 +1,6 @@
 name: Lint
 
-on: [ pull_request ]
+on: pull_request
 
 jobs:
   lint:

.github/workflows/mkdocs_check.yml

@@ -21,5 +21,5 @@ jobs:
           path: .cache
           restore-keys: |
             mkdocs-material-
-      - run: pip install mkdocs-material mkdocstrings mkdocstrings-python pymdown-extensions mkdocs-jupyter
+      - run: pip install mkdocs-material mkdocstrings mkdocstrings-python pymdown-extensions mknotebooks
       - run: mkdocs build

README.md

@@ -1,4 +1,12 @@
-# ![GraphiQ](https://raw.githubusercontent.com/graphiq-dev/graphiq/main/docs/img/logos/logo-light.png)
+# 
+
+<p align="center">
+  <picture>
+    <source media="(prefers-color-scheme: dark)" srcset=docs/img/logos/logo-dark.png>
+    <source media="(prefers-color-scheme: light)" srcset=docs/img/logos/logo-light.png>
+    <img alt="Shows a black logo in light color mode and a white one in dark color mode." src=docs/img/logos/logo.png>
+  </picture>
+</p>
 
 <div align="center">