Remove glamor

[brandongregoryscott]

Overview

This PR removes glamor (as well as classnames) from our dependencies and relies almost solely on ui-box for styling (defaulting to an in-line style object where props are unhandled). There are some breaking changes:

• All of the component themes leveraging selectors are now nested under a selectors key, which is passed to the selectors Box prop. Any consumers overriding these values in a custom theme will need to follow suit.
  • We can probably throw together a codemod that does this, but it also isn't too bad to do manually.
• The Positioner component's css value now returns BoxCssProps [due to the selectors change], so it isn't 1:1 compatible if consumers were leveraging this component in a similar fashion by creating a classname with glamor.

Additional thoughts:

• We might want to take this opportunity to remove the classicTheme since it hasn't been maintained/supported and isn't worth the effort in retrofitting for this change. (#1559)
• We could also use this opportunity to remove the deprecated Nudge, SegmentedControl and SidebarTab components. I wrote a codemod in one of my TypeScript port branches that could port most of the Nudge and SidebarTab instances over to Pulsar and Tab respectively, so I could dig those up and include them for ease-of-migration. (#1558)

Screenshots (if applicable)

Please see the Deploy Preview and compare it to the current production Storybook instance.

Documentation

• [ ] Updated Typescript types and/or component PropTypes
• [ ] Added / modified component docs
• [ ] Added / modified Storybook stories

[netlify[bot]]

✅ Deploy Preview for evergreen-storybook ready!

Name	Link
🔨 Latest commit	05e0411a48876873bfbe694587a4f3839c591201
🔍 Latest deploy log	https://app.netlify.com/sites/evergreen-storybook/deploys/6386294f014ba000093acf70
😎 Deploy Preview	https://deploy-preview-1554--evergreen-storybook.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site settings.