Generate Order Invoice properly(akin to Tickets)

[mrsaicharan1]

Describe the bug
The order invoice which is currently being generated is a screenshot of the page. Instead of this, we need to replace this with a generation of a proper PDF, similar to how the tickets are generated.

To Reproduce
Steps to reproduce the behavior:

1. Go to any event ticket
2. Click on Order Invoice

Expected behavior
A page should be printed with proper fields, rather than a screenshot.

Additional context
Working on this.

[mrsaicharan1]

@CosmicCoder96 What are the fields which we exactly need to include?

[abhinavk96]

As of now, the ones we have tried to incorporate on the frontend. See the current invoice structure, also all the billing info.