[Multichain] Supported chains new layout and ranking

[0xdeval]

What to do?

We need to change layouts of supported chains in dropdowns as well as on the home page
In addition to this, we need to take into account a ranking of chain during the displaying of them on UI

More context about changes and what to do is on the Notion task: https://www.notion.so/blockscout/Multichain-explorer-V2-Supported-chains-displaying-and-ranking-2bd3d73641f880278b3cd254cc725e23?v=1c07091d838743c99a710a4e83f34117&source=copy_link#2c43d73641f880398f5ad5d0f40f7715

Blocked by:

• Metrics per supported multichain explorer chain blockscout-rs#1581

[0xdeval]

UPD 12.01:

• Should be available this week

[0xdeval]

@tom2drum The API is available on https://blockscout.github.io/swaggers/services/multichain-aggregator/main/index.html#/ClusterExplorerService/ClusterExplorerService_ListChainMetrics