test commands from ink tutorials

[jangorecki]

Considering that ink tutorials are being used by people who most often don't have any experience with ink. Any commands that are outdated, and doesn't work, are really a difficult obstacle for newcomers.

Myself I went through #286 and #285 (among the others, not related to outdated documentation...).

I think it can easily discourage newcomers from completing tutorials.

From the readme of this repo:

We really want to have good documentation here and allow people to be productive right from the start.

Ultimate solution is to include all commands from tutorial into automated testing in CI, in case any of commands is out of date, CI test job will fail, and developers will be notified about update needed.