Add Events Calendar Page

[nishant-nayak]

The events calendar page should have the following features:

• Fetch all public events (past, present and future) and display them in a calendar view on a webpage
• Calendar should have normal monthly view, weekly view (optional) and list view (list all present and future events)
• Clicking on an event should either lead to its own page with details or open a modal on the same page with the event details. Details should include any relevant metadata related to the event and a link to the event webpage if it exists

Notes:

• Calendar can integrate with a Google Calendar owned by [email protected] so that we can make iCal subscriptions available and rendering might be easier too
• For now, creation of events can happen through the Django admin console itself by the webmaster. Until we have a working permissions model, we can't assign fine-grained permissions for every user.
• IRIS CEMS can be used as a rough reference for what we might need in a calendar view.