Add diagrams and GitHub Action.

.github/workflows/docs.yml

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+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
+      - name: Generate index
+        run: |
+          echo '<ul>' > _site/diagrams/index.html
+          for file in _site/diagrams/*; do
+            name="${file##*/}"
+            echo "<li><a href='$name'>$name</a></li>" >> _site/diagrams/index.html
+          done
+          echo '</ul>' >> _site/diagrams/index.html
+
+      - 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/brent-request.d2

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+Pick container: Which container do you need?
+Replacement: Why do you need a\nreplacement container?
+About you1: Summary\nEND { style.fill: lightgrey }
+About you2: Summary\nEND { style.fill: lightgrey }
+About you5: Summary\nEND { style.fill: lightgrey }
+why_sacks: Why do you need\nmore sacks?
+why_green: Why do you need a\nreplacement container?
+Call us: Call us\nEND { style.fill: lightgrey }
+
+Pick container -> Call us: Grey bin
+Pick container -> why_sacks: Clear sack
+Pick container -> why_green: Green bin
+Pick container -> Replacement: Other
+
+why_sacks -> About you1: I am a new resident\nwithout any
+why_sacks -> About you1: I have used all\nthe sacks provided
+
+why_green -> About you2: My container\nis damaged
+why_green -> About you2: My container\nis missing
+
+Replacement -> About you5: I am a new resident\nwithout a container
+Replacement -> About you5: My container\nis damaged
+Replacement -> About you5: My container\nis missing
+Replacement -> About you5: I would like an\nextra container

diagrams/kingston-request.d2

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+Pick container: Which container do you need?
+Replacement: Why do you need a\nreplacement container?
+Replacement2: Why do you need a\nreplacement container?
+Recycling swap: Would you like to replace\nyour recycling box containers\nwith a wheelie bin?
+Recycling swap2: Would you like to replace\nyour recycling box containers\nwith a wheelie bin?
+Recycling number: How many\nboxes/\ncontainers?
+Recycling number2: How many\nboxes/\ncontainers?
+Notes missing: Can you give us any\ninformation about what\nhappened to your container?
+Notes damaged: What happened to\nyour container?
+About you1: About/\nSummary/\nEND { style.fill: lightgrey }
+About you2: About/\nSummary/\nEND { style.fill: lightgrey }
+About you3: Confirm\nAbout/\nSummary/\nEND { style.fill: lightgrey }
+About you4: About/\nSummary/\nEND { style.fill: lightgrey }
+About you5: About/\nSummary/\nEND { style.fill: lightgrey }
+About you6: About/\nSummary/\nEND { style.fill: lightgrey }
+About you7: Confirm\nAbout/\nSummary/\nEND { style.fill: lightgrey }
+
+Pick container -> Replacement: Other
+Pick container -> Recycling swap: Recycling bin\n(don’t have a bin)
+Pick container -> About you1: Recycling blue stripe bag\nor Paper single use bag
+Pick container -> Replacement2: Recycling box
+
+Replacement2 -> Recycling number2: Damaged/\nMissing
+Replacement2 -> Recycling number: New resident\nwithout\na container
+Replacement2 -> Recycling swap2: I need an additional\ncontainer/bin
+
+Replacement -> About you2: New resident\nwithout\na container
+Replacement -> Notes damaged: Damaged
+Replacement -> Notes missing: Missing
+
+Recycling swap -> Replacement: No
+Recycling swap -> About you3: Yes
+
+Recycling swap2 -> Recycling number: No
+Recycling swap2 -> About you7: Yes
+
+Recycling number2 -> Notes damaged: Damaged
+Recycling number2 -> Notes missing: Missing
+Recycling number -> About you4
+
+Notes missing -> About you5
+Notes damaged -> About you6

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
+
+

diagrams/sutton-request.d2

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+Pick container: Which container do you need?
+Replacement: Why do you need a\nreplacement container?
+About you: About/\nSummary/\nEND { style.fill: lightgrey }
+
+Pick container -> Replacement: Other
+Pick container -> About you: Recycling blue stripe bag\nor Paper single use bag
+
+Replacement -> About you: Damaged/\nMissing