* add model save load guide

* polish details

* fix index number

* polish hapi & add note

* add_totorial_for_paddle test=develop

* fix_index test=develop

* fix_index_tutorial test=develop

* fix_index test=develop

* fix_index test=develop

* fix_index test=develop

* fix index test=develop

* change_md_to_rst test=develop

* fix image path test=develop

* fix index test=develop

* fix image test=develop

* fix_image test=develop

* fix image test=develop

* change title test=develop

* update configs & 2.0 examples

* move apis directory

* update api names

* add_faq_index test=develop

* remove layout

* add_guides for paddle test=develop

* add_guides to index test=develop

* fix_guides_index test=develop

* fix_en_docs test=develop

* remove old index test=develop

* refine doc of stack

* update paddle api

* fix typo

* fix doc

* fix sample code

* fix code-block

* add program api & update example

* replace correct jit.save/load

* update program api example

* refind rand, randn, standard_normal, normal, randint, randperm docs

test=develop

* test=develop

* polish load and saveloadconfig doc

* adjust alias

* fix index test=develop

* fix some api index test=develop
Co-authored-by: NTC.Long <chenlong@TCLongdeMacBook-Pro.local>

add the doc for the logic ops, add the broadcasting ops

* add float16 dtype, test=develop

* add type for unique

* add unique doc