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Config module expansion and watchers (#2648)

This PR primarily solidifies the use of the `core/config` module for setting global and component specific configurations. As part of this update, config now has an API for setting watches. This allows watching for changes to a specific property of the config map and running a mixin callback. This has been leveraged by the `core/palette` module which no longer has its own set/remove API in favor of using the config module directly.

A new pattern has also been implemented for using Sass's `with` clause allowing the `$config` map to directly set the properties of the config module. Documentation has been added to explain this method as an option for config management.

**Additional changes**
- `CodeExample` - Now accepts a `label` prop for setting label text for the code example.
- `CodeExpander` - New component for displaying large blocks of code that can be expanded and collapsed.
- `Popover` - Now accepts an `href` prop that switches to an anchor markup trigger instead of button.
- `ReferenceBar` - Now accepts a `hash.text` prop and converted it to a BEM component along with styles.
- `ReferenceCard` - Now accepts a `ref` prop that renders a link for external references.
- `core/config` - Updated docs to reflect changes.
- `core/css` - Added `ReferenceBar` documentation for functions and mixins.
- `core/palette` - Updated docs to reflect changes.
- `core/theme` - Added `ReferenceBar` documentation for functions and mixins.
- `core` `base` - Updated docs to reflect changes. 
- `base` - Added comment documentation to the config default object.
- `core/config` - Now has a `merge` mixin for merging a mixin type property with another map.
- `core/config` - The `apply` method no longer takes a `prefix` argument. 
- `core` `base` - Applied new `CodeExpander` component for documenting config options for each component.
- `core` - Moved all config setting into the sass root `_config.scss` file. This represents th... (continued)

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