Upgrade to storybook v7

[jessicashanshanhuang]

Upgrading our current storybook version to the latest version 7, refer to this issue for context.

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[damonmcc]

@TylerMatteo made changes to not pin exact package versions and to drop the addition of the design add-on

[damonmcc]

noting that I've been trying to resolve a concern: seeing storybook 8 in the lock file diff for peer dependencies

running npm install from main (no changes to package.json) fails with

While resolving: @nycplanning/streetscape@0.10.1
Found: storybook@7.6.20
node_modules/storybook
  dev storybook@"^7.4.1" from the root project

Could not resolve dependency:
peer storybook@"^8.2.7" from @storybook/components@8.2.7
node_modules/@storybook/components
  peer @storybook/components@">=7.0.12" from @chakra-ui/storybook-addon@5.1.0
  node_modules/@chakra-ui/storybook-addon
    dev @chakra-ui/storybook-addon@"^5.0.1" from the root project

Fix the upstream dependency conflict, or retry
this command with --force or --legacy-peer-deps
to accept an incorrect (and potentially broken) dependency resolution.

and npm install --legacy-peer-deps doesn't fail, but generates 5 instances of:

"peerDependencies": {
  "storybook": "^8.2.7"
}