Sync 11.01.2021

[ligi]

• https://github.com/ethereum/sourcify/issues/346
• make the monday calls open?
• https://github.com/ethereum/sourcify/pull/105
• https://github.com/ethereum/sourcify/pull/114

[DeFiYaco]

• Discuss message for already verified contracts in the new UI https://github.com/ethereum/sourcify/issues/334
• https://github.com/ethereum/sourcify/issues/347

[franzihei]

• Discuss open questions about new UI https://github.com/ethereum/sourcify/issues/345