Add CA branding to Storybook UI and document process

[erichuffman]

Update the Storybook UI for the resource library to have CivicActions branding, and document the process.

• Look into swapping the Storybook logo in upper right with CA branding
• Look for other opportunities to apply CA colors to Storybook's chrome, but avoid degrading usability/accessibility of stock palette
• Look into any supporting add-ons/plugins in Storybook contrib space for branding
• Include robust comments in related files and consider adding a page under the documentation section outlining process to brand storybook

[dgading]

We could use this ticket as a sort of spike. The outcome being a milestone for a branded storybook instance with issues generated for each of the tasks. Like one for the logo, one for documentation, etc...