chore: update node to v.16 (#458)

- Update node to v.16
- Remove unused Dockerfile

Fixes the failing build, caused by newer package-lock.json version i previous commit

.github/workflows/github-pages.yml

@@ -13,6 +13,9 @@ jobs:
       with:
         submodules: true
         persist-credentials: false
+    - uses: actions/setup-node@v2
+      with:
+        node-version: '16'
 
     - name: Info
       run: echo "Running on branch $(basename ${{ github.ref }})"
@@ -24,7 +27,7 @@ jobs:
       run: mkdir docs_out
 
     - name: Build documentation # only if this was triggered from latest
-      if: github.ref == 'refs/heads/latest' 
+      if: github.ref == 'refs/heads/latest'
       run: |
         npm run docs
         npm run postdocs

.github/workflows/npmpublish.yml

@@ -9,10 +9,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-node@v1
+      - uses: actions/setup-node@v2
         with:
-          node-version: 12
-          registry-url: https://registry.npmjs.org/
+          node-version: '16'
+          registry-url: 'https://registry.npmjs.org/'
       - run: npm ci
       - run: npm run pub
         env:

.github/workflows/unittests.yml

@@ -8,12 +8,12 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [12.x]
+        node-version: [16.x]
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
     - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v1
+      uses: actions/setup-node@v2
       with:
         node-version: ${{ matrix.node-version }}
     - name: npm install, build, and test