Update Landing Page

[jbriones1]

Motivation behind the feature and what it will do

The landing page doesn't seem to mesh well with the rest of the application, so it should be updated.

Which part of the application will this feature be for?

Main site

Minimal Viable Product

• Change the style of the button to better match the VSCode style, using the green colour prevalent around the site
• Add a button to join the Discord

Code changes

• Updating home.component.*
• Updating the cs-code/button component