fix: css issues

[jaredgalanis]

• there was an issue with the loading of coreUI.css from the index.html file in production builds
• this moves coreUI to be a bundled css file
• this also removes an invalid import of branding.css that was unrelated, but throwing a browser console error
• this also fixes broken loading of logos and other static config assets

addresses: #1027 Bootstrap 5 css not loading in pass-ui production build