[Enhancement] Configurable UI Style

[giranm]

Summary

We are using Bootstrap via react-bootstrap which powers the design of the PagerDuty Live Console UI.
Some users have also requested the ability to modify certain characteristics such as:

• Dark Mode
• Custom Colour Palette
• Compact Table Rows

This ticket has been raised to track and investigate potential approaches to implementing some of the characteristics above.

[giranm]

The FixedSizeList component has a property called itemSize which determines the overall row height.

pd-live-react/src/components/IncidentTable/IncidentTableComponent.js

Line 315 in a8c2f41

itemSize={60}

It is currently set to 60 px, but changing this to 45 provides a more compact view - perhaps this should be updated as the user updates UI preferences.

Default

Compact Test

[giranm]

Requires completion of #200 and #298