[ANNOUNCE] ledger API documentation available online

[Alexis]

Hello all,

ledger's API documentation is now available at:

https://ledger-cli.org/doc/api/

The API documentation is generated from ledger's source code using
doxygen. It features a custom navigation header you all know
and love from ledger-cli.org, support for dark mode, SVG based
dependency graphs, and more.
The API documentation is updated as needed, at the very least with
every ledger release.

Note that improving the documentation is an ongoing effort, if you have
experience with technical documentation or doxygen or C++ or all of
the aforementioned you are welcome to contribute. As stated on the API
documentation main page:
"In case you find [the API] documentation incorrect, incomplete, unclear,
or lacking please open a pull request [https://git.ledger-cli.org/ledger/pulls]."


Enjoy
Alexis