Mintscan links to upgrade height countdown broken

[ffe9f8]

Link to "countdown" broken on the following pages:

• https://docs.axelar.dev/resources/mainnet/upgrades/v18
• https://docs.axelar.dev/resources/mainnet/upgrades/v19
• https://docs.axelar.dev/resources/testnet/upgrades/v18
• https://docs.axelar.dev/resources/testnet/upgrades/v19
• https://docs.axelar.dev/resources/testnet/upgrades/v20
• https://docs.axelar.dev/resources/testnet/upgrades/v21
• https://docs.axelar.dev/resources/testnet/upgrades/v24
• https://docs.axelar.dev/resources/testnet/upgrades/v25
• https://docs.axelar.dev/resources/testnet/upgrades/v26
• https://docs.axelar.dev/resources/testnet/upgrades/v27
• https://docs.axelar.dev/resources/testnet/upgrades/v29
• https://docs.axelar.dev/resources/testnet/upgrades/v31
• https://docs.axelar.dev/resources/testnet/upgrades/v32
• https://docs.axelar.dev/resources/testnet/upgrades/v34
• https://docs.axelar.dev/resources/testnet/upgrades/v35
• https://docs.axelar.dev/resources/tokens/wrapped-tokens

Checking mintscan page with "https://testnet.mintscan.io/axelar-testnet/blocks/2471750" leads to page not found error.

https://www.mintscan.io/axelar-testnet/block/2471750 gives a Failed to load dataCannot read properties of undefined (reading 'block_id') error. Searching the block has the same link pop up, but data also fails to load.

[ffe9f8]

Remove countdowns for past upgrades