ci: add prettier formatting (#130)

.github/workflows/format.yml

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+name: Prettier
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  prettier:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          # Make sure the actual branch is checked out when running on pull requests
+          ref: ${{ github.head_ref }}
+
+      - name: Run prettier
+        uses: creyD/prettier_action@v4.3
+        with:
+          commit_message: "style: format code with prettier"
+          prettier_options: "--write styles/**/*.css"

.prettierignore

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+/styles/codeberg/
+/styles/reddit/

.prettierrc

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+{
+  "overrides": [
+    {
+      "files": "styles/**/*.css",
+      "options": {
+        "parser": "less"
+      }
+    }
+  ]
+}