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update development document.

As requirement of #2390 , removed multiphase from WebUI, document, and put all trials flatten on WebUI.

1. The major change is to split trial-jobs to trials in webui, and use parameter id as part of trial id.
2. If multiphase is enabled, the limitation of trial controls job count only, not trials actually.
3. When multiphase enabled, the trial status may not be right. Previous trials in a job will be marked as success, only last trial presents the job's status.
4. multiphase related documents and UX are removed.

minor changes,
1. Update dev document for webui development.

To support Windows node in remote mode, this PR adds a layer of commands (osCommands) to deal difference between Windows and Unix-like OS. To share code, ShellExecutor is added to enrich original SshClient class.

I will implement windows version commands in next phase.

This pattern can be expanded to Local or other platform in future, so I moved related code to common folder for sharing.

Add shell support for ssh connection, so that remote script can be started with user environment.

Minor fixes,

1. Fix gpu_metrics_collector to support pyenv. As pyenv will create one more process, so that original pgrep code always got extra processes, and cannot start gpu_metrics_collector.
2. Fix NASUI failure on dev-install-node-modules, to create subfolder every time.
3. Fix MakeFile to reduce mis-created links, and other minor issues.
4. Add node --watch for nni_manager for better dev experience.

* Update MNIST example path in docs

* revert chinese doc

* update readme in ga_squad

* update readme

* fix typo

* Update README.md

* Update README.md

* Update README.md

* update readme

* update

* fix path

* update reference

* fix bug in config file

* update nni_arch_overview.png

* update

* update

* update

* update home page

* update default value of metis tuner

* fix broken link in CommunitySharings

* update docs about nested search space

* update docs

* rename cascding to nested

* fix broken link

* update

* update issue link

* fix typo

* update evaluate parameters from GMM

* refine code

* fix optimized mode bug

* update import warning

* update warning

* update optimized mode

* first commit for update doc structure

* mv the localmode and remotemode to traningservice

* update

* update for readthedoc.io