Refactor Technical Reference > Polkadot Hub > Overview page

[kapetan3sid]

Acceptance criteria:

• Refactor Technical Reference > Polkadot Hub > Overview page
• https://docs.google.com/spreadsheets/d/1ZuQksBKS9miyf2OUc8Aa-jIGjMlyX7gIWaMdogGsqQU/edit?gid=534880564#gid=534880564

[todortodorovic]

#1237