Generate and publish documentation to GitHub Pages

.github/workflows/build-docs.yml

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+name: build-docs
+
+on:
+  push:
+    branches:
+      - master
+      - feature/docs
+
+jobs:
+  run-docfx:
+    if: "!(contains(github.event.head_commit.message, '[skip ci]') || contains(github.event.head_commit.message, '[ci skip]'))"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2
+        with:
+          repository: Cysharp/DocfxTemplate
+          path: docs/_DocfxTemplate
+      - uses: Kirbyrawr/docfx-action@master
+        name: Docfx metadata
+        with:
+          args: metadata docs/docfx.json
+      - uses: Kirbyrawr/docfx-action@master
+        name: Docfx build
+        with:
+          args: build docs/docfx.json
+      - name: Publish to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: docs/_site

docs/.gitignore

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+###############
+#    folder   #
+###############
+/**/DROP/
+/**/TEMP/
+/**/packages/
+/**/bin/
+/**/obj/
+_site
+_DocfxTemplate

docs/api/.gitignore

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+###############
+#  temp file  #
+###############
+*.yml
+.manifest

docs/docfx.json

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+{
+  "metadata": [
+    {
+      "src": [
+        {
+          "files": [
+            "UniTask/Assets/Plugins/UniTask/Runtime/*.cs"
+          ],
+          "src": "../src"
+        }
+      ],
+      "dest": "api",
+      "disableGitFeatures": false,
+      "disableDefaultFilter": false
+    }
+  ],
+  "build": {
+    "globalMetadata": {
+      "_disableContribution": true,
+      "_appTitle": "UniTask"
+    },
+    "content": [
+      {
+        "files": [
+          "api/**.yml",
+          "api/index.md"
+        ]
+      },
+      {
+        "files": [
+          "articles/**.md",
+          "articles/**/toc.yml",
+          "toc.yml",
+          "*.md"
+        ]
+      }
+    ],
+    "resource": [
+      {
+        "files": [
+          "images/**"
+        ]
+      }
+    ],
+    "overwrite": [
+      {
+        "files": [
+          "apidoc/**.md"
+        ],
+        "exclude": [
+          "obj/**",
+          "_site/**"
+        ]
+      }
+    ],
+    "dest": "_site",
+
+    "globalMetadataFiles": [],
+    "fileMetadataFiles": [],
+    "template": [
+      "_DocfxTemplate/templates/default-v2.5.2",
+      "_DocfxTemplate/templates/cysharp"
+    ],
+    "postProcessors": [],
+    "markdownEngineName": "markdig",
+    "noLangKeyword": false,
+    "keepFileLink": false,
+    "cleanupCacheHistory": false
+  }
+}

docs/index.md

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+---
+title: Home
+---
+# UniTask
+
+Provides an efficient async/await integration to Unity.
+
+https://github.com/Cysharp/UniTask

docs/toc.yml

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+- name: API Documentation
+  href: api/
+  homepage: api/Cysharp.Threading.Tasks.html
+
+- name: Repository
+  href: https://github.com/Cysharp/UniTask
+  homepage: https://github.com/Cysharp/UniTask