Restructure frontend files into feature folders

[rohanpurohit]

This PR includes:

• Move alarms.tsx from alarms to app/toolbar
• move shared components to top-level shared folder
• move Carousel component to app/landing-page
• rename modules/logs to modules/event-logs
• remove ModesPage (it's deprecated)
• move ModesDropDown to app (as this shows the current HFNC mode in some screens, therefore not removed, but needs to be deprecated later)
• move rotary encoder related files to shared/rotary
• move multistep wizard into a separate folder in app

TODO (for future PR):

• decompose icons from top-level folder into feature folders
• move Controllers to shared/values

[ethanjli]

TODO: just a simple test to make sure everything works, and then approve

[rohanpurohit]

1. This project is licensed under Apache License v2.0 for any software, and Solderpad Hardware License v2.1 for any hardware - do you agree that your contributions to this project will be under these licenses, too? Yes.
2. Were any of these contributions also part of work you did for an employer or a client? No.
3. Does this work include, or is it based on, any third-party work which you did not create? No.

[rohanpurohit]

Tested the frontend and accessed standard features on the backend simulator and everything looks good to me. since these were just file restructuring and the content inside the files hasn't changed, I'll be merging this in.