Update to Storybook 8, update Stylelint, and bug fixes

[HaSistrunk]

Fix issues #222 , #117 . Does not include Style Library CSS updates.

Updates to Storybook version 8 and brings all other dependencies up to their most current versions. Changes include:

• Remove Babel - a new storybook webpack5 compiler is being used now (SWC)
• Replace the deprecated @storybook/preset-scss with @storybook/addon-styling-webpack to handle our Sass color variable :export that is used in the Colors story.
• Replace @storybook/addons with @storybook/manager-api

Update to Sass 1.77.8, supported by updating to Stylelint 16.9.0 (along with updated stylelint configs):

• Sass discourages and will eventually phase out the use of @ import , so replaced with @ use. I followed the updated sass-boilerplate templates for this change. This means being explicit about where variables, mixins, and functions are defined instead of being available globally.
• Sass lighten and darken are not included in the new module system, so replaced as suggested with color.adjust
• Remove stylelint-a11y because it was not supported by stylelint version above v13, and wasn't doing much for us anyway.

Other changes:

• Remove font weight 800 from typography story, because we don't use it.
• Fix minimap story bug that wasn't displaying different minimap widths correctly.
• Add attribution to sass-boilerplate repo in our readme
• Update test syntax

I also checked out Chromatic as a way to do visual regression testing in Storybook (since it is now supported by Storybook 8), but we determined it wasn't that useful currently for our Storybook use - visual regression in specific sites, as we do with BackstopJS, is more helpful for our use cases.