Release process: consider using beta versions

[JoshuaKGoldberg]

I'm planning on flighting a 6.0.0-beta0 before 6.0.0. Should this be part of the regular process?

[IllusionMH]

It is good idea.
6.x is good start for this practice, but I'm not familiar with audience and ways how they get new versions, and how long to wait for feedback for this first beta.

Few point may be addressed to make this flow more effective:

• at this point there are no docs for devs on how to get preview (alpha/beta/insiders) builds (probably tag next as in TypsScript)
• tag in npm to simplify getting new preview releases
• recommendations where to use preview versions and what to expect
• perhaps some info channel

P.S. nit: is it -beta0 or -beta.0. Later format (with ., more readable) is used for TS, TSLint, React, Babel and former I've find only in Office Fabric UI.