Support for multiple chat view themes, fonts and font size

What's Changed

• Add code block and syntax highlight with highlight.js npm (from cdn) package by @darkelfs56 in #52
• Add more chat view themes by @olasunkanmi-SE in #55
• introduce more fonts and support for user font size choice by @olasunkanmi-SE in #57
• disable the text box by @olasunkanmi-SE in #58

New Contributors

• @mVedr made their first contribution in #43
• @darkelfs56 made their first contribution in #52

Full Changelog: v1...v2