Restructure pipelines and badges

- Seperate test pipeline into E2E, integration and unit test pipelines.
- Improve documenetation for pipelines (ci-cd.md).
- Introduce naming convention for worklow files and names.
- Center badges with multiple files on README file.

.github/workflows/checks.quality.yaml

@@ -0,0 +1,27 @@
+name: quality-checks
+
+on: [ push, pull_request ]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        lint-command:
+          - npm run lint:vue
+          - npm run lint:yaml
+          - npm run lint:md
+          - npm run lint:md:relative-urls
+          - npm run lint:md:consistency
+      fail-fast: false # So it continues with other commands if one fails
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup node
+        uses: actions/setup-node@v1
+        with:
+          node-version: 15.x
+      - name: Install dependencies
+        run: npm ci
+      - name: Lint
+        run: ${{ matrix.lint-command }}