fix(shortcodes): size the file fence to the file it wraps - #2148

Changed pages include:

• index.html - view
• en/index.html - view
• fr/index.html - view
• nl/index.html - view
• en/404.html - view
• en/about/index.html - view
• en/blocks-demo/index.html - view
• en/blog/index.html - view
• en/cookies/index.html - view
• en/docs/index.html - view

There are more changes not included in the list