Switch to GitHub Actions for CI/CD

.github/FUNDING.yml

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+custom: https://paypal.me/kevinchalet

.github/workflows/build.yml

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+name: build
+
+on:
+  push:
+    branches: [ dev, rel/* ]
+    tags: [ '*' ]
+  pull_request:
+    branches: [ dev, rel/* ]
+
+jobs:
+  build:
+    name: ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ windows-latest ]
+        include:
+          - os: windows-latest
+            os_name: windows
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Setup DocFX
+      shell: pwsh
+      run: |
+        nuget install docfx.console -Version 2.24.0
+        docfx.console.2.24.0\tools\docfx docfx.json
+        if ($lastexitcode -ne 0)
+        {
+            throw [System.Exception] "docfx build failed with exit code $lastexitcode."
+        }
+
+    - name: Update the documentation pages
+      shell: pwsh
+      run: |
+        git config --global core.autocrlf false
+        git config --global credential.helper store
+        Add-Content "$env:USERPROFILE\.git-credentials" "https://${{ secrets.GH_PAGES_ACCESS_TOKEN }}:x-oauth-basic@github.com`n"
+        git config --global user.email "OpenIddict Bot"
+        git config --global user.name "32257313+openiddict-bot@users.noreply.github.com"
+        git clone https://github.com/openiddict/openiddict-documentation.git -b gh-pages origin_site -q
+        Copy-Item origin_site/.git _site -Recurse
+        CD _site
+        Remove-Item docfx.console.2.24.0 -Force -Recurse
+        git add -A 2>&1
+        git commit -m "Update the documentation pages" -q
+        git push origin gh-pages -q