The skeleton of the new homepage (#21355)

...rise/frontend/src/metabase-enterprise/whitelabel/index.js

frontend/src/metabase-types/api/activity.ts

frontend/src/metabase-types/api/index.ts

frontend/src/metabase-types/api/mocks/activity.ts

frontend/src/metabase-types/api/mocks/index.ts

...nd/src/metabase/auth/containers/AuthLayout/AuthLayout.tsx

frontend/src/metabase/components/MetabotLogo.jsx

frontend/src/metabase/components/MetabotLogo.tsx

frontend/src/metabase/entities/recents.js

frontend/src/metabase/home/homepage/actions.ts

frontend/src/metabase/home/homepage/analytics.ts

...mepage/components/CollectionSection/CollectionSection.tsx

...ponents/CollectionSection/CollectionSection.unit.spec.tsx

...abase/home/homepage/components/CollectionSection/index.ts

...age/components/DatabaseSection/DatabaseSection.styled.tsx

...e/homepage/components/DatabaseSection/DatabaseSection.tsx

.../components/DatabaseSection/DatabaseSection.unit.spec.tsx

...etabase/home/homepage/components/DatabaseSection/index.ts

...age/components/GreetingSection/GreetingSection.styled.tsx

...e/homepage/components/GreetingSection/GreetingSection.tsx