docs(welcome-to-docs): add cuHacking Google calendar

[HasithDeAlwis]

What is the feature?

Since the docs are our main source of truth, we want to ensure, someone can go to the docs site and have everything they need. Therefore, it only makes sense to have our Google calendar on our docs site to minimize any context switching and confusion.

Overview

• Google Calendar was chosen because it's inherently easy to share and a tool that almost everyone will have access to
• We chose the welcome page of the docs so that our calendar is easily viewable by all

Solution

Use Full Calendar package to showoff our google calendar because of its ease of use, open source, and it works with the Google API

Describe alternatives you've considered

• google-react-calendar: harder to use, not as intuitive and customizable
• react-calendar: doesn't work with Google API easily

Goals

1. Have robust testing for the calendar
2. Ensure the calendar is responsive