project: rename vx => visx

[williaster]

🏠 Internal

This PR makes the following updates throughout the entire monorepo for the project rename as described in #802:

• [package.json]
  • updates package names, keywords, and (dev/peer)dependencies from @vx/* => @visx/* (and @vx/vx => @visx/visx)
  • updates github.com/hshoff/vx => github.com/airbnb/visx
• updates CI references from vx => visx where needed
• updates all packages/vx-* directory names to packages/visx-* (and vx-vx => visx/visx)
• updates all vx references in code + READMEs to visx e.g.,
  • import * from '@vx/* => import * from '@visx/*
  • className="vx-*" => className="visx-*
  • npm package badges
• [demo]
  • updates all sandbox package.jsons as described above
  • updates all sandbox directories sandboxes/vx-* => sandboxes/visx-*
  • updates variable/type names like VxPackages => VisxPackages
• updates all instances of vx-demo.now.sh/* => airbnb.io/visx/* where the new demo site will live
• updates the contributors of the root package.json to me, @hshoff, and @kristw who are currently the most active airbnb contributors

All filename changes were made with git mv to preserve history as much as possible. It looks like the web UI is calling some of these new files, but the commits locally showed renames so it may be better than it looks here 🤞 .

💥 Breaking Changes

• [all packages] vx-... classNames are renamed to visx-...
• [demo] existing codesandbox links (code that generates these is updated, I mean those referenced in PRs etc.) which reference vx-demo directory structure will break (example). These can be converted by doing something like the following:
  • github/hshoff/vx/tree/master/packages/vx-demo/src/sandboxes/vx-pack (before)
  • github/airbnb/visx/tree/master/packages/visx-demo/src/sandboxes/visx-pack (after)
• [tooltip] className="vx-tooltip-portal" => visx-tooltip (so as not to be confused with the new TooltipInPortal)

Testing

• CI
  • locally
  • PR
• demo site works
• test publishing @visx/*
  • all released as @visx/*@0.0.200-alpha.0 (e.g., @visx/shape)
  • published packages tested with test /axis demo sandbox

@hshoff @kristw