CDPT-1712: Initial setup

[EmilyHazlehurst]

• Config
• Add docs
• Install Timber and init in functions file
• Set up webpack
• Add build commands
• Add linting commands
• Define frontend structure
• Add variables for styles
• Add and configure storybook
• Add icon files and logo
• Add Button component
• Add link component

[EmilyHazlehurst]

I'm going to merge this now to make the other PRs a bit easier to read as they're all based on it, but I'll keep an eye on the conversations :)