feat: implement init notebook behavior#27

FilipPyrek merged 4 commits intomaindeepnote/vscode-deepnote:mainfrom

fpyrek/grn-4761-load-and-install-requirementstxt-from-the-project-filedeepnote/vscode-deepnote:fpyrek/grn-4761-load-and-install-requirementstxt-from-the-project-fileCopy head branch name to clipboard