Connect welcome view (UI) and new connection status bar (#24)

* New UI/functionality
 - Welcome view added.
 - Status bar added
 - NodeConfig view removed and the functionality was moved to the status bar.

* Update package.json - removing redundant condition.
Co-authored-by: Xuefei Han <[email protected]>

* The welcome view messages updated.
Co-authored-by: Manas Kumar Das <[email protected]>

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Co-authored-by: Xuefei Han <[email protected]>
Co-authored-by: Manas Kumar Das <[email protected]>