fix(ui): add development instructions to README to get started with UI

Description

• Updated /ui/README.md with starting instructions
• Removed @craco/craco dep from @postgres.ai/shared package
• Added @craco/craco dep to @postgres.ai/platform and @postgres.ai/ce packages
• Removed create-file-webpack dep from @postgres.ai/shared package
• Added create-file-webpack dep to @postgres.ai/platform and @postgres.ai/ce packages

Checklist

• MR description has been reviewed
• MR changes are functionally tested
• MR does NOT have text changes OR there are text changes and they have been reviewed
• MR does NOT have API/CLI changes OR there are API/CLI changes and they have been reviewed
• MR does NOT have UI changes OR there are UI changes and they have been reviewed