FLUID-5276: Renamed styles.css to OverviewPanel.css
FLUID-5276: Updated link to style.css to OverviewPanel.css
FLUID-5276: Changed the OverviewPanel welcome text from "Fluid" to "Infusion". Also changed the link destination to match Infusion.
FLUID-5276: Renamed classnames to be specific to the component, following closely to the Fluid classname convention. Fixed some bugs with contrast themes.
FLUID-5276: Fixed a bug where the overviewPanel was blocking interaction with underlying content even though the panel has been visibly hidden off screen.
FLUID-5276: Make the overviewPanel title link configurable
Merge remote-tracking branch 'jhung/FLUID-5276' into FLUID-5276

Conflicts:
	src/components/overviewPanel/html/overviewPanelTemplate.html