mgr/dashboard: fix details card and sidebar component styles

mgr/dashboard: fix details card and sidebar component styles

- add the correct header sizes for both components
- remove unnecessary div nesting
- detail card was using cdsRow directive but that messes with the
  alignment since micro components shouldn't use the 2xgrid structure.
Instead it needs to rely on stacks or css grids. So adding 3 grid
structure that matches with the design and eliminating any css
customizations.

Fixes: https://tracker.ceph.com/issues/74184
Signed-off-by: Nizamudeen A <nia@redhat.com>