chore(docker): compose, entrypoint guard, LF shell script; format with Prettier

- Add docker-compose.yml (build context .) and .gitattributes for entrypoint LF
- README: document docker compose and gregWiki root requirement
- package.json: include docker-compose.yml in npm run format

Made-with: Cursor

Dockerfile

@@ -1,10 +1,15 @@
-# Build context: this repository root (gregWiki).
-# Runs the Docusaurus dev server with hot reload.
+# Build context MUST be this repository root (directory containing package.json).
+# Correct:   docker build -t gregwiki .
+# Wrong:     docker build -f gregWiki/Dockerfile ..   → COPY fails or image has no package.json
+# Dev server with hot reload. For production static files use: npm run build + any static host.
 FROM node:20-alpine
 WORKDIR /app
 ENV NODE_OPTIONS="--max-old-space-size=4096"
+COPY docker-entrypoint.sh /usr/local/bin/docker-entrypoint.sh
+RUN chmod +x /usr/local/bin/docker-entrypoint.sh
 COPY package.json package-lock.json ./
 RUN npm ci --ignore-scripts
 COPY . .
 EXPOSE 3000
+ENTRYPOINT ["docker-entrypoint.sh"]
 CMD ["npm", "run", "start", "--", "--host", "0.0.0.0", "--port", "3000"]