Polish the session list and details view

[sandhose]

This is another round of alignment with the design.

A few things this does:

• simplify the session details view, using composable components, instead of a big 'SessionDetails' component with many props
• factors out the 'end session' buttons for each session type, meaning that the dialog content is the same whether we're ending the session from the session details view or the session list view
• rename 'sign out' to 'remove device', and 'sign out' with 'sign out of account'
• move the sign out button to the bottom of the main page
• remove some unnecessary abstractions, like 'BlockList' and 'Block'
• use the 'VisualList' from compound, remove our own implementation
• make sure the page doesn't overflow the screen with big device IDs
• use the device name/client name as much as possible instead of the device ID
• remove the navigation/greeting layout from the session details view

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