Generate markdown TOC

[ghost]

#243 . This PR evolved from a spike into implementation.

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[ghost]

I encountered a blocking issue where the es6 and commonjs module systems were clashing. It was unclear what was forcing commonjs. I wasn't able to understand the root cause. It might take some time to understand it.

I implemented a workaround where I implemented my own functionality instead of using the library that was having difficulties. It's working so far, but may encounter issues when trying to use other libraries that are necessary.

• Create a follow-up issue after this PR to investigate why commonjs and es6 were clashing when using unist-util-visit

The new issue is #298 .

[ghost]

I am purely refactoring and cleaning up code from this point onwards. The essentials are all in place.