Tutorial restructuring

[ricwo]

Proposed changes:

• restructuring of the tutorials

Status (please check what you already did):

• made PR ready for code review
• added some tests for the functionality
• updated the documentation
• updated the changelog

[amn41]

thanks @ricwo ! I made a few more tweaks. I wanted to motivate the users a bit by showing an example right at the top, rather than burying the running bot at the end of the tutorial.

[amn41]

@tmbo @ricwo I removed line numbers in f1a8d36 because this causes a bunch of blank lines to be rendered. Supposedly fixed in latest rtd-theme but when I merged with our fork it didn't resolve the issue for me.

[tmbo]

Which empty lines do you mean? I can't see any at http://core.rasa.ai/tutorial_basics.html and I am not sure why that should have changed with this PR

[amn41]

@tmbo http://core.rasa.ai/master/tutorial_basics.html

[tmbo]

ok we had that before - this is not an issue of empty lines, the lines are just not aligned to the line numbers

[amn41]

what's the fix? shall I revert that commit then?

[tmbo]

Give me a sec, looking into it right now

[tmbo]

Ok @amn41 the fix got lost right here:

28e5842#diff-5bef800b7655c038d4f6f2a972d7b354L1

not sure why though. Can you add these line to docs/_static/custom.css again (file got deleted in that commit put is present in master, just without these lines...)