* initial commit
* fix: added initialize method to fix the previous/next links rendering
* added checks
* open first markdown/ipynb in the book ans expand the view
* added launch book from command pallete, removed the pick folder and save option added launching the first notebook/markdown
* moved the open book command pallet action from mssql to notebooks
* open as untitled to true
* opening markdown files issue fix
* removed opening as untitled files
* open ipynb files as untitled and changes for previous&next links to work
* add books as seperate viewlet
* localize double quote issues and renamed treeCollapsibleState
* renames and added logic to conditionally show Preview command
* moved registerCommands from widget to extension contribution
* isEditorUntitled check
* async comment updates
* formatting issues.
* promisfying the async calls
* moved existsAsync to top
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