Resolve #3546791 "Tab competitors 2"

For #3546791 (but does not close)

• Lifts state up to the App layer so that other tabs can access all data
• Restores keywords when moving between tabs
• Displays the list of competitor URLs (unstyled)
• Stores the unchecked competitor URLs

Testing instructions

• Run npm install
• Run npm run dev -w app
• Go to the site, enter keywords (with the first being jawn)
• Go to the next tab (either Generate content guidance button or directly through the tab) and see a set of competitor URLs
• Uncheck some URLs, navigate to a different tab and back. Verify the URLs are still unchecked.
• Go back to the keyword tab, remove the keywords and add new ones (as long as the first one isn't jawn)
• Go to Competitors and verify the URLs have been updated, and are all checked