Addition of PST information

[t8]

This PR includes all of the information necessary for users to learn about the addition of our PST to the platform. Because the concept of cryptocurrency and profit sharing tokens is not mainstream, we need to lay this information out in a way that is not too difficult to understand.

The main sections of the page I see as crucial are:

• [x] What is it?
  • This provides a general overview as to what the token is
• [x] Benefits
  • Discusses ways our PST is used on the platform
• [x] Token metrics
  • Provides realtime data of the most recent PST transactions and largest owners of the token
• [x] How to exchange
  • Information on how users can exchange

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[martonlederer]

Great job with this

[notfilippo]

👍🏻