Rework the pipeline tutorial
Author: Narsil
Pull request: yes

# What does this PR do?

- Switch to `asr` instead of another NLP task.
- It also has simpler to understand results.
- Added a section with interaction with `datasets`.
- Added a section with writing a simple webserver.

Should help users: https://github.com/huggingface/transformers/issues/20414

@stevhliu 
@sgugger 
@mishig25 

If I could have some initial feedback on the general direction that'd be great.

After the direction is validated, I will go and fix all the tests and links.
And also check more the actual result formatting in the end documentation to add/remove stuff like `<tip>` to make it hopefully more readable.


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Models:

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Comments:
_The documentation is not available anymore as the PR was closed or merged._

> Should we also make a brief mention of [chunk batching](https://huggingface.co/docs/transformers/main_classes/pipelines#pipeline-chunk-batching)?

I feel like it's nice that it is transparent for most users, but adding a link might be nice. How would you present it ?

I accepted most of the comments which are pure improvement save for two, where I think the result would be less than it is currently.

Also I feel the language tone is less human-like and more polished overall.
Making things polished and neutral is probably a lot better, especially for non natives. 
I'm just mentioning that because for tutorials, I like when there's a story unraveling, and not too monotone. 
Here I think the result with your suggestions are balanced between the two.
Thank you  !!

Thanks @stevhliu for the remarks !