diff --git a/.github/workflows/copilot-setup-steps.yml b/.github/workflows/copilot-setup-steps.yml
new file mode 100644
index 0000000..4222f33
--- /dev/null
+++ b/.github/workflows/copilot-setup-steps.yml
@@ -0,0 +1,34 @@
+name: "Copilot Setup Steps"
+
+# Automatically run the setup steps when they are changed to allow for easy validation, and
+# allow manual testing through the repository's "Actions" tab
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - .github/workflows/copilot-setup-steps.yml
+  pull_request:
+    paths:
+      - .github/workflows/copilot-setup-steps.yml
+
+jobs:
+  # The job MUST be called `copilot-setup-steps` or it will not be picked up by Copilot.
+  copilot-setup-steps:
+    runs-on: ubuntu-latest
+
+    # Set the permissions to the lowest permissions possible needed for your steps.
+    # Copilot will be given its own token for its operations.
+    permissions:
+      # If you want to clone the repository as part of your setup steps, for example to install dependencies, you'll need the `contents: read` permission. If you don't clone the repository in your setup steps, Copilot will do this for you automatically after the steps complete.
+      contents: read
+
+    # You can define any steps you want, and they will run before the agent starts.
+    # If you do not check out your code, Copilot will do this for you.
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+
+      - name: Setup Deterinate Nix
+        uses: DeterminateSystems/nix-installer-action@main
+        with:
+          determinate: true
diff --git a/mkdocs.yml b/mkdocs.yml
index 15b682e..adffe37 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -100,7 +100,7 @@ theme:
       primary: green
       accent: yellow
       toggle:
-        icon: material/brightness-auto
+        icon: lucide/sun-moon
         name: Switch to light mode
 
     # Palette toggle for light mode
@@ -109,7 +109,7 @@ theme:
       primary: green
       accent: yellow
       toggle:
-        icon: material/brightness-7
+        icon: lucide/sun
         name: Switch to dark mode
 
     # Palette toggle for dark mode
@@ -118,7 +118,7 @@ theme:
       primary: green
       accent: yellow
       toggle:
-        icon: material/brightness-4
+        icon: lucide/moon
         name: Switch to light mode
 
 # plugins