Move source to csnx

[sndrs]

relies on

• Storybook upgrade and tidyup in Source source#1608
• https://github.com/guardian/CSTI-team/issues/2

[tjsilver]

• Refactor Storybook in Source to make a more standard implementation
• Migrate src folder and changelog files from
  • source-foundations
  • source-react-components
  • source-react-components-development-kitchen
  • eslint-plugin-source-foundations
  • eslint-plugin-source-react-components
• Decide on whether to migrate git history
• Migrate git history if applicable (decided to wait and see if we need to do this)
• Do we want to migrate the central Source readme? Where do we surface a link to the storybook etc..

[tjsilver]

Migration steps

• Raise PR
• Fix review comments
• Disable Source deployments in CSNX
• Merge migration PRs
• Merge existing PRs into Source repo
• Short freeze & make final copy of Source and changelogs
• Archive Source repo
• Enable Source deployments in CSNX
• Defrost code

[tjsilver]

Migration tasks

• Source/CSNX migration: Fix storybook
• Remove Eslint-config storybooks (READMEs) (closed)
• Source/CSNX migration: find lowest working dev version of typescript for eslint-config-typescript
• Source/CSNX migration: Reinstate all scripts in project.json
• un-ignore various files
• ./scripts/paths.ts - do we need to bring this over too?
• Decide on place for main Source README and add it, link to other READMEs
• Move other stories from Source docs/ folder over and decide how to display them (own AWS Amplify page as well?)
• Create Source Docs Storybook
• Merge any PRs on Source
• Copy any changed/new components in src folders over
• Copy Source CHANGELOGs over again
• upgrade any deps that need it / add any new ones since skeletons were created

Post migration tasks

• Archive Source repo with note of where it's migrated to
• Investigate problems with composed Storybook: Investigate problems with composed Storybook #238
• Remove unused preview files from individual package storybooks (e.g. preview.tsx storysort etc)
• Update any links to old Source GH pages - see this issue
• Audit 'root' Source docs for relocation / generalisation to CSNX / abandonment
• Fix Foundations/Typography Storybook links from story to heading anchors in composed storybook view - not in individual storybook- see this issue
• Storybook - Update links to Github repo in component comments (prefixed with [Github]) - I think these show as links in Storybook ie - see this issue
• Fix links back to the Source storybook in our zeroheight documentation #312

• make shared storybook environment config for all Source projects - we had to replicate them in all Source projects