[docs] IDEFICS guide and task guides restructure (#26035)
* initial commit for the IDEFICS task guide
* conversational example
* updated TOC
* fixed typos
* Apply suggestions from code review
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
* addressed feedback
* bad_words_ids
* Apply suggestions from code review
Co-authored-by: Victor SANH <victorsanh@gmail.com>
* rank classification note
* feedback addressed
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Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
Co-authored-by: Victor SANH <victorsanh@gmail.com>
