[Infra Refactor] Add tooltip functionality

[CrackTheCode016]

Highlight the main issue(s) below:

Many Polkadot/ecosystem terms pop up in content ("parachain", "Cumulus", "FRAME"), it would be helpful to have this be a tooltip for each of these terms! This would be helpful for beginners.

What is the proposed solution?

There are two options:

• Develop a custom component and a glossary.json/md
• Use this existing solution: https://github.com/grnet/docusaurus-terminology