feat: tweaks styling of Alerts

[Golodhros]

Summary of Changes

Tweaks the alerts styling to be more eye-catching
Updated storybook

Tests

Ran tests
Tested manually

Screenshots

Documentation

Upated screenshots

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[kristenarmes]

LGTM! one small thing is the img called notices-warning-dashboard.png is a table view (rather than dashboard) could maybe just rename it for accuracy

[Golodhros]

LGTM! one small thing is the img called notices-warning-dashboard.png is a table view (rather than dashboard) could maybe just rename it for accuracy

Makes sense, done!