docs: collapse code

[holic]

Adds a component to wrap docs code snippets so that we can collapse lines that are far away from highlighted lines.

• code blocks start collapsed, but can individually be expanded
• adds a faint dotted line between snipped lines to make it clear they're in different sections of the file
• "copy" button will still copy the entire code block (including hidden lines)

collapsed:

collapsed hover:

expanded (and what it looks like prior to this change):

[holic]

check it out here: https://mud-docs-git-holic-docs-collapse-code-latticexyz.vercel.app/tutorials/emojimon/a-wild-emojimon-appears

[alvrs]

This is very cool! Small nit: the dotted line is very hard to see on the dark theme:

Not blocking though!