Reorganize handbook
The primary goal here is to solve the problem that "things that should be documented might not be getting written down because there isn’t a clear place to put them", in Danielle's words.
In this first iteration, we will:
-
spread https://about.gitlab.com/handbook/meltano/ out over multiple pages (Product, Marketing, Engineering, etc): gitlab-com/www-gitlab-com!34349 (merged), and -
move content there that's currently in https://www.meltano.com/docs/ but doesn't really fit there: !1159 (merged) and gitlab-com/www-gitlab-com!34656 (merged).
Moving this handbook into its own repo and onto the meltano.com domain can be done later, and will be tracked in #1252 (closed).
Edited by Douwe Maan