Moving this component to the component folder so it's closer to where it is actually used. Not moving to the `homebrew` folder because ultimately i think pretty much everything in that folder should move to the components as well (`homebrew` isn't a helpful folder distinction).
Deletes a directory, moves 2 files.
This commit only renames things, changes no logic. Any mention of "book", "view", or "mode" is renamed in relation to "spreads".
The AnchoredBox.jsx file is renamed to Anchored.jsx
Extra icons are deleted, and the remaining ones are renamed.
Big change to how the AnchoredBox component is structured so that it can be used in more than just one spot. Now composed of the wrapper Anchored, with two children AnchoredTrigger and AnchoredBox, each of which can have their own arbitrary children.
Next steps will involve renaming the component file to Anchored.jsx, moving most styling out of the attached stylesheet (and into brewRenderer.less), and adding props to pass in Anchor Positioning properties.
Refactoring the AnchoredBox component because I wanted to set focus on the trigger button when the expanded box was closed. Wrapping the trigger into it's own component, with forwardRef, allows for passing the `ref` to the actual DOM node. Then the `.focus()` method will work on it.
Adds a new AnchoredBox component that is functionally a clone of the "saving error" notifications, but drops a lot of the JS in favor of the new (chrome-only!) CSS Anchor Positioning API. In subsequent commits, either alternate styling or a polyfill will be added non-supported browsers.
The box contains a few inputs that modify the CSS applied to `.pages`, most critically a "start on right" toggle for the Facing Pages mode.
