site: Add an org selection view when users first visit the organizations feature

- only show org selection view on first visit and store user's selection in local storage
- Display orgs as a vertically scrolling list with a max height of (need to decide the max height)


Figma:
https://www.figma.com/design/OR75XeUI0Z3ksqt1mHsNQw/Dashbord-v1?node-id=684-4995