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* Fixed the following:
pipe -> pipeline
out in pipe(data()) is a list of dict, not a dict

* Fixed the TypeError: __init__() missing 1 required positional argument: 'key'

* Added a tip: code sample requires additional libraries to run

* Fixed custom config's name

* added seqeval to the required libraries

* fixed a missing dependency,
fixed metric naming,
added checkpoint to fix the datacollator

* added checkpoint to fix the datacollator,
added missing dependency

* Update doc example feature extractor -> image processor

* Apply suggestions from code review

* Reorganize doc for multilingual support

* Fix style

* Style

* Toc trees

* Adapt templates

* ✨ create concept guide section

* 🖍 make fixup

* 🖍

 apply feedback
Co-authored-by: Steven <stevhliu@gmail.com>

* First files

* More files

* Last files

* Style

* 📝 add config section

* 📝 finish first draft

* 📝 add feature extractor and processor

* 🖍 apply feedback from review

* 📝 minor edits

* last review