cascadess 0.2.0

• The CSS styles applied by the package are now consistent with those applied by the Bootstrap framework.
• The package is now intended to mesh well with {bslib} and other Bootstrap-based {shiny} packages.
• A number of functions have been renamed to increase the clarity of their purpose and effect, e.g. background() to background_color().
• Additionally, a few functions have been broken into multiple functions.