dashboard.py: add expert mode with 'delete machine' button
Add expert mode in the machine view that enables/disables the DELETE MACHINE button when selected.
Fixes: https://gitlab.freedesktop.org/mupuf/valve-infra/-/issues/114
Disabled chexkbox:
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Add expert mode in the machine view that enables/disables the DELETE MACHINE button when selected.
Fixes: https://gitlab.freedesktop.org/mupuf/valve-infra/-/issues/114
Disabled chexkbox: