feat: splitted generateDocs and changed the output

Splitted the `generateDocs` function in `extract` and `organise`
functions.
The `extract` function extracts comments from the code and it cleans
them up.
The `organise` function returns all the sections and the names of the
root sections. Every returned section has a `subsections` property which
lists the names of the subsections.

BREAKING CHANGE

chore(package): updated package version to 1.0.2

chore(package): added to scripts

feat(generator): added generateDocs function

Added `generateDocs` function which gets in input the source code and returns the documentation based on the comments in the code.