Draft: Resolve "Parts of documentation still assume one block is backed per minute"

Closes #8 (closed)

• docs/baking/reward.md, starting with line 11. The whole calculation can be updated.
• docs/deploy-a-node/introduction.md, line 15.
• docs/tezos-basics/economics-and-rewards.md, Line 145, Section Inflation.
• docs/tezos-basics/governance-on-chain.md, Line 24.
• docs/tezos-basics/operations.md Line 89. It might need further changes because of Tenderbake.
• maybe even more?