GitLab

* update docs

* move en docs under en_US

* update gitignore

* fix image link

* add doc guide

* add napoleon ext

* fix lex format for code

* fix doc links

* hide api reference

* delete orphan files

* fix deadlink in FAQ

* remove email address

* fix deadlinks for deleted orphan files

fix indents of doc,
change nni to NNI
yaml to yml(file) and YAML(doc)

Fix document with formats and typos

* update local demo doc and configuration

* change folder name

* Update tutorial_1_CR_exp_local_api.md

no need to have a new training file

* Delete mnist_gpu.py

no need to have a new training file

* Update config_gpu.yml

no need to have a new training file

update v0.3.0 release note

* doc refactor

* image name refactor