[dev] change npm script names
[dev] change npm script names

Summary:
`npm run cloud` felt nicer than:
`npm run start-cloud`

Test Plan: manual

Reviewers: juan, spang, mark, khamidou, halla

Reviewed By: halla

Differential Revision: https://phab.nylas.com/D4124

nirmit/nylas-mail,nylas-mail-lives/nylas-mail,nylas-mail-lives/nylas-mail,nylas-mail-lives/nylas-mail,nirmit/nylas-mail,simonft/nylas-mail,simonft/nylas-mail,simonft/nylas-mail,nirmit/nylas-mail,nirmit/nylas-mail,nylas/nylas-mail,nylas-mail-lives/nylas-mail,nylas/nylas-mail,simonft/nylas-mail,nylas/nylas-mail,nirmit/nylas-mail,nylas/nylas-mail,simonft/nylas-mail,nylas/nylas-mail,nylas-mail-lives/nylas-mail