Remove CircleCI and add GitHub Actions instead

.github/workflows/documentation.yml

@@ -0,0 +1,23 @@
+# .github/workflows/documentation.yml
+name: Documentation
+
+on: [release]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Generate Documentation
+        uses: SwiftDocOrg/swift-doc@master
+        with:
+          inputs: "Sources/Submissions"
+          module-name: Submissions
+          output: "Documentation"
+      - name: Upload Documentation to Wiki
+        uses: SwiftDocOrg/github-wiki-publish-action@v1
+        with:
+          path: "Documentation"
+        env:
+          GH_PERSONAL_ACCESS_TOKEN: ${{ secrets.WIKI_ACCESS_TOKEN }}

.github/workflows/test.yml

@@ -0,0 +1,18 @@
+name: test
+on:
+- pull_request
+jobs:
+  vapor_macos:
+    runs-on: macos-latest
+    env:
+      DEVELOPER_DIR: /Applications/Xcode_11.4.1.app/Contents/Developer
+    steps:
+    - uses: actions/checkout@v2
+    - run: xcrun swift test --enable-test-discovery --sanitize=thread
+  vapor_bionic:
+    container: 
+      image: vapor/swift:5.2-bionic
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - run: swift test --enable-test-discovery --sanitize=thread