Clear up UX confusion related to the desktop setting page

[sabaimran]

1. It's not immediately clear that the application is running a background sync job to keep the folders and files in sync with the backend server
2. It's not obvious that the Save button triggers a full re-indexing operation of all the configured data. It seems as if it is required for the settings to be honored.

[sabaimran]

On the server side, the save and reinitialize buttons should be removed. We may eventually want a way to quickly reinitialize entries based on their compiled content, but we're no longer able to pull files directly from the data sources. Instead, let the jobs run independently and be triggered by the Notion, GitHub settings pages.