Documentation: Blocks Tutorial

[AdamMarton]

Blocks Tutorial links to a repository where one can download a tutorial project to learn basic concepts of Gutenberg Blocks.

Code snippets in the very next chapter is referencing to a different directory structure (can be found here).

While it's not a game-breaker, it's definitely not up to date.

[ajitbohra]

Documentation refers to following https://github.com/WordPress/gutenberg-examples

Not https://github.com/ahmadawais/gutenberg-boilerplate-es5 mentioned in issue

[gziolo]

It looks like we should audit gutenberg-examples and ensure they stay in sync with the tuotrial. /cc @mkaz @nosolosw