Overview small fixes

Lauri Himanenrequested to merge
overview-small-fixes into v0.10.0

Contains fixes to issues discussed in #505 (closed). Please see attached screenshots to see how the new alerts look like before emerging. The new alerts are based on the Alert-component from MUI with different severity.

  • New alert for loading large system: Screenshot_2021-03-08_NOMAD

  • New error alert style: Screenshot_2021-03-08_NOMAD_1_

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