Copy over a template from severance_snape. Get OSM parsed and displayed

from various sources.

(Still lots that should be moved to common libs somewhere)

.github/workflows/web.yml

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+name: Deploy web
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install node
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18.x
+          cache: 'npm'
+          cache-dependency-path: web/package-lock.json
+
+      - name: Install wasm-pack
+        uses: jetli/[email protected]
+
+      - name: Cache WASM build
+        uses: actions/cache@v3
+        with:
+          path: target
+          key: doesnt-matter-share-everything
+
+      - name: Build web app
+        run: |
+          cd web
+          npm ci
+          npm run wasm
+          npm run build --if-present
+
+      - name: Publish
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./web/dist/

.gitignore

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+*.swp
+target/
+node_modules/
+# Local symlink to avoid hitting od2net.org
+web/public