chore: restructure codebase

[Sec-ant]

Please check the README.md from this PR for details.

Closes #2.

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Latest commit: 1089140

The changes in this PR will be included in the next version bump.

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@sec-ant/readable-stream	Minor

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[Sec-ant]

Hi, @ehmicky

This PR should address your concern in #2. I'd love to hear your thoughts (The changes are all over the repo, so I suggest just check the base branch of this PR).

And please check the README.md file for further details and use the CodeSandbox-CI package for local testing :)

If all goes well, I plan to release it as v0.4.0.

[ehmicky]

This looks good to me! Thanks a lot @Sec-ant!