optimise the npm package structure

Fixes #8

.github/workflows/dependabot.yml

@@ -0,0 +1,7 @@
+version: 2
+updates:
+  - package-ecosystem: npm
+    directory: "/"
+    schedule:
+      interval: daily
+    open-pull-requests-limit: 10

.github/workflows/publish.yml

@@ -0,0 +1,36 @@
+# This workflow will run tests using node and then publish a package to GitHub Packages when a release is created
+# For more information see: https://docs.github.com/en/actions/publishing-packages/publishing-nodejs-packages
+
+name: Publish packages
+
+on:
+  release:
+    types: [created]
+  workflow_dispatch:
+
+jobs:
+  build:
+    name: Build bundle and publish to npmjs.com
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout ${{ matrix.node }}
+        uses: actions/checkout@v3
+
+      - name: Setup Node.js ${{ matrix.node }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18
+
+      - name: Cache dependencies ${{ matrix.node }}
+        uses: action/cache@v3
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-node-${{ matrix.node }}-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-$ {{ matrix.node }}
+        run: |
+          npm ci
+          npm run build
+          npm publish --access public
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.npm_token}}

.github/workflows/test-suite.yml

@@ -0,0 +1,56 @@
+name: Test suite
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  lintjs:
+    name: Javascript standard lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v3
+
+      - name: setup node
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18
+
+      - name: cache dependencies
+        uses: actions/cache@v3
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-
+      - run: npm ci
+      - run: npm run lint
+
+  unittest:
+    name: unit tests
+    runs-on: ubuntu-latest
+    needs: [lintjs]
+    strategy:
+      matrix:
+        node: [16, 18, 20]
+    steps:
+      - name: Checkout ${{ matrix.node }}
+        uses: actions/checkout@v3
+
+      - name: Setup node ${{ matrix.node }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node }}
+
+      - name: Cache dependencies ${{ matrix.node }}
+        uses: actions/cache@v3
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-node-${{ matrix.node }}-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-${{ matrix.node }}
+      - run: npm ci
+      - run: npm run test