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

@@ -1,4 +1,4 @@
-name: Quality checks
+name: quality-checks
 
 on: [ push, pull_request ]
 

.github/workflows/checks.security.yaml

@@ -1,4 +1,4 @@
-name: Security checks
+name: security-checks
 
 on:
   push:

.github/workflows/release.desktop.yaml

@@ -1,4 +1,4 @@
-name: Deploy desktop
+name: desktop-release
 
 on:
  release:

.github/workflows/release.git.yaml

@@ -1,4 +1,4 @@
-name: Bump & release
+name: git-release
 
 on:
   push: # Ensure a new release is created for each new tag

.github/workflows/release.site.yaml

@@ -1,4 +1,4 @@
-name: Deploy site
+name: site-release
 
 on:
  release:

.github/workflows/tests.e2e.yaml

@@ -0,0 +1,28 @@
+name: e2e-tests
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  run-tests:
+    strategy:
+      matrix:
+        os: [macos, ubuntu, windows]
+      fail-fast: false # So it still runs on other OSes if one of them fails
+    runs-on: ${{ matrix.os }}-latest
+    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: Run e2e tests
+        run: npm run test:e2e -- --headless

.github/workflows/tests.integration.yaml

@@ -1,9 +1,9 @@
-name: Test
+name: integration-tests
 
 on:
   push:
   pull_request:
-  schedule: # for integration tests
+  schedule: # To get notified about problems from third party dependencies
     - cron: '0 0 * * 0' # at 00:00 on every Sunday
 
 jobs:
@@ -25,13 +25,6 @@ jobs:
       -
         name: Install dependencies
         run: npm ci
-      -
-        name: Run unit tests
-        run: npm run test:unit
       -
         name: Run integration tests
         run: npm run test:integration
-      -
-        name: Run e2e tests
-        if: always() # Run even if previous step fail
-        run: npm run test:e2e -- --headless

.github/workflows/tests.unit.yaml

@@ -0,0 +1,28 @@
+name: unit-tests
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  run-tests:
+    strategy:
+      matrix:
+        os: [macos, ubuntu, windows]
+      fail-fast: false # So it still runs on other OSes if one of them fails
+    runs-on: ${{ matrix.os }}-latest
+    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: Run units
+        run: npm run test:unit