ci: added github action that publishes to npm

Author: Íñigo Marquínez Prado

.github/pull_request_template.md

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+### Main changes
+
+- :bug: (fix)
+- :new: (feat)
+- :wrench: (chore)
+- :cloud: (ci)
+- :memo: (docs)
+- :art: (style)
+- :arrows_counterclockwise: (refactor)
+- :chart_with_upwards_trend: (perf)
+- :microscope: (test)
+- :bangbang: (breaking change)
+
+### Additional notes
+
+(optional)
+
+### Context
+
+- :ticket: Closes / Relates _ticket number_

.github/workflows/npm-publish.yml

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+# This workflow will publish a package to npm when a release is created
+# For more information see: https://help.github.com/actions/language-and-framework-guides/publishing-nodejs-packages
+
+name: Publish package to npm public registry
+
+on:
+  release:
+    types: [ published ]
+
+jobs:
+  publish-npm:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check-out the repository
+      uses: actions/checkout@v2
+    - name: Setup node version 16.13.0 (LTS)
+      uses: actions/setup-node@v2
+      with:
+        node-version: '16.13.0'
+        registry-url: 'https://registry.npmjs.org'
+    - name: Install production dependencies
+      run: npm ci --production
+    - name: Publish package to npm
+      run: npm publish --ignore-scripts --access public
+      env:
+        NODE_AUTH_TOKEN: ${{ secrets.NPM_GUIDESMITHS }}
+

.nvmrc

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+v16