Add diagrams and GitHub Action.

.github/workflows/docs.yml

@@ -0,0 +1,41 @@
+name: Deploy D2 documentation to pages
+
+on:
+  push:
+    branches: [ diagrams ]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/configure-pages@v4
+      - name: Install packages
+        run: curl -fsSL https://d2lang.com/install.sh | sh -s --
+      - name: Generate diagrams
+        run: |
+          for file in diagrams/*.d2; do
+            base="${file%.*}"
+            ~/.local/bin/d2 $file _site/$base.svg -t 105 --sketch
+          done
+      - uses: actions/upload-pages-artifact@v3
+  deploy:
+    needs: build
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

.gitignore

@@ -1,2 +1,4 @@
 node_modules
 package-lock.json
+
+/diagrams/*.svg

diagrams/sutton-bulky.d2

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+shape: sequence_diagram
+
+user: { shape: person }
+
+user -> WasteWorks: Submits\nbulky form
+
+WasteWorks.t -> Echo: PostEvent with\nevent details
+
+WasteWorks.t -> Payment\nprovider: Redirect user to\npayment provider
+
+Payment\nprovider -> WasteWorks: Redirect back after\nsuccessful payment
+
+WasteWorks."Parameters verified\nusing SHA-OUT"
+
+WasteWorks.t2 -> User: Payment confirmation screen
+
+WasteWorks.t2 -> User: Email with booking details
+
+WasteWorks.t2 -> Echo: UpdateEvent with\npayment details
+
+