Install missing OS dependencies

Missing fonts cause layout issues.

Closes #6

Author: remcohaszing

.github/workflows/ci.yml

@@ -47,7 +47,7 @@ jobs:
           path: ~/.cache/ms-playwright
           key: playwright-${{ hashFiles('package-lock.json') }}
       - run: npm ci
-      - run: npx playwright install
+      - run: npx playwright install --with-deps
       - run: npm test
       - uses: actions/upload-artifact@v3
         if: always()

README.md

@@ -11,10 +11,13 @@ using [puppeteer](https://pptr.dev).
 ## Installation
 
 ```sh
-npm install  remark-mermaidjs
+npm install remark-mermaidjs
 ```
 
-Since this package uses Google Chrome, You have to make sure it’s available on your system.
+Since this package uses Google Chrome, You have to make sure it’s available on your system. You may
+also need to install some additional packages, such as fonts, depending on your system. For more
+information, see the Puppeteer
+[troubleshooting](https://github.com/puppeteer/puppeteer/blob/main/docs/troubleshooting.md) guide.
 
 ## Usage