Note: The issue with the sidebar overlapping the tab-bar on mobile
devices was fixed, and a hover colour was added for the bottom tab-bar.

Changes:
- Populate BottomBar.tsx and styles.scss with the relevant code required
to generate a bottom bar on screens less than 992px in width

Changes:
- Create a bottom bar folder and setup the required files
- Fix the top navigation bar styling (reduce height)

Changes:
- Update brand icon size to 40x40
- Add IBM Plex Sans in buttons and brand text
- Fix layout and centering of navbar elements
- Remove navigation pills and items

Note: Fixed an issue caused by breaking the link (to include IBM Plex
Sans) across multiple lines

Note: Added support for IBM Plex through the Google Font API.