Add GitHub Actions workflow

.github/workflows/continuous-integration.yml

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+name: osu-wiki continuous integration
+
+on:
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  ci:
+    name: remarkjs, changed files
+    runs-on: ubuntu-latest
+    steps:
+      - name: sparse checkout
+        shell: bash
+        run: |
+          # repository url, utilising provided github credentials
+          REPOSITORY="https://${{ github.actor }}:${{ github.token }}@github.com/${{ github.repository }}.git"
+          # merge commit ref name (with refs/heads/ stripped out)
+          BRANCH="${GITHUB_REF/#refs\/heads\//}"
+
+          git version
+          # clone without blobs; don't checkout to avoid fetching them anyway
+          git clone --filter=blob:none --no-checkout ${REPOSITORY} .
+          git config --local gc.auto 0
+
+          # set up sparse checkout
+          git sparse-checkout init
+          git sparse-checkout set '**/*.md' '**/.remark*' '**/*.json'
+
+          # fetch the merge commit ref
+          git -c protocol.version=2 fetch --no-tags --prune --progress --depth=2 origin +${GITHUB_SHA}:refs/remotes/origin/${BRANCH}
+          git checkout --progress --force -B $BRANCH refs/remotes/origin/$BRANCH
+
+      - name: setup node
+        uses: actions/setup-node@v1
+
+      - name: install remark
+        run: npm install
+
+      - name: run remark on changed files
+        # stdout is discarded (remark prints files being checked there)
+        run: git diff ${{ github.sha }}^ ${{ github.sha }} --name-only '*.md' | xargs npx remark -qf --no-stdout --report=vfile-reporter-position --color

.gitignore

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+# prevent accidental addition of files from local remark runs
+node_modules/
+package-lock.json

package.json

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+{
+    "name": "osu-wiki",
+    "description": "home of the osu! wiki",
+    "repository": "github:ppy/osu-wiki",
+    "dependencies": {
+        "remark-cli": "latest",
+        "remark": "latest",
+        "remark-preset-lint-markdown-style-guide": "latest",
+        "remark-frontmatter": "latest",
+        "remark-lint-definition-case": "latest",
+        "remark-lint-fenced-code-flag": "latest",
+        "remark-lint-final-definition": "latest",
+        "remark-lint-final-newline": "latest",
+        "remark-lint-list-item-indent": "latest",
+        "remark-lint-list-item-spacing": "latest",
+        "remark-lint-maximum-heading-length": "latest",
+        "remark-lint-maximum-line-length": "latest",
+        "remark-lint-no-duplicate-definitions": "latest",
+        "remark-lint-no-duplicate-headings": "latest",
+        "remark-lint-no-duplicate-headings-in-section": "latest",
+        "remark-lint-no-emphasis-as-heading": "latest",
+        "remark-lint-no-file-name-articles": "latest",
+        "remark-lint-no-file-name-consecutive-dashes": "latest",
+        "remark-lint-no-file-name-irregular-characters": "latest",
+        "remark-lint-no-file-name-mixed-case": "latest",
+        "remark-lint-no-heading-content-indent": "latest",
+        "remark-lint-no-heading-indent": "latest",
+        "remark-lint-no-heading-like-paragraph": "latest",
+        "remark-lint-no-html": "latest",
+        "remark-lint-no-missing-blank-lines": "latest",
+        "remark-lint-no-shortcut-reference-link": "latest",
+        "remark-lint-no-tabs": "latest",
+        "remark-lint-no-undefined-references": "latest",
+        "remark-lint-no-unused-definitions": "latest",
+        "remark-lint-ordered-list-marker-value": "latest",
+        "remark-lint-table-pipe-alignment": "latest",
+        "vfile-reporter-position": "latest"
+    }
+}