Upgrade React to version 18

• Dump React to version 18 and all dependencies to their latest version.
• Did some minor changes and additions.

Upgrade MUI to v5 and React Router to v6

This release was an insane upgrade. There are still many enhancements to implement, but this release focused on getting the latest Material UI and React Router versions in.

• Version bump to v0.4.0.
• Upgraded MUI from v4 to v5.
• Upgraded React Router from v5 to v6.
• Refactoring of routes.
• Optimized performance and slightly changed theme layout.

Enhancements and bug fixes

• Version bump to v0.3.2.
• Added favourites icon to bookmark list items.
• Implemented proper read-me file.

Initial production release

Third generation release. In this release Material-UI was used instead of Bootstrap as per the previous version. Much better React coding and best practices.