drop support for CommonJS distribution

[thescientist13]

Summary

I think by the time this project hits 1.0, we can probably be OK dropping the CJS bundle. It was only really needed for this 11ty plugin but now 11ty supports ESM as of v3.0.0.

Details

With this we can can remove

• dist entry in package.json files
• prepublishOnly and dist scripts
• rollup.config.js and entry in devDependencies
• This work around - https://github.com/ProjectEvergreen/wcc/blob/0.12.1/src/wcc.js#L135 / WCC dropping query params when loading module URLs #158

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One thought: maybe it would be good to keep a build script around just to make sure there are no build issues, like we are seeing with #93?