Changelog
* 973a2fe chore: add comment
* 9487110 chore: add help
* 30871e9 chore: better gif [skip ci]
* 4aaf06f chore: better gif crop [skip ci]
* c7fa7ea chore: make gif slightly smaller [skip ci]
* 375d47e chore: remove unused file
* 1dc0db1 chore: rename test
* e21db15 chore: show help in readme also
* a27cb66 chore: update readme [skip ci]
* 8a76482 fix: a node cannot be its own child
* 201c528 refactor: delegate more on systems
* 491ed38 refactor: factor out navigate