Multiple plugins have an incorrect homepage in package.json

[pnevares]

• Rollup Plugin Name: multiple
• Rollup Plugin Version: any monorepo version
• Rollup Version: n/a
• Operating System (or Browser): n/a
• Node Version: n/a

How Do We Reproduce?

Run npm docs on a plugin with an incorrect homepage set.

Expected Behavior

Plugin's README is displayed

Actual Behavior

404 or root README for rollup/plugins is displayed

#109 and #110 aren't the only plugins with an incorrect homepage set, I can handle the remaining ones if those get merged.