Support Clusters as the only Name service

[ulyanas]

This is an improvement for this feature:
#2816
#2991

Some chains indicated that https://clusters.xyz/ can be used as the only name service. This will require UI adjustments:

• Navigation Main menu > Name services lookup remains as is, but the icon should be more generic
• Tabs Domains/Directories are hidden in this case
• Add link to https://clusters.xyz/?utm_source=blockscout to the note: Clusters is a cross-chain name service for managing addresses on multiple blockchains using a universal naming directory
• Remove capital letter: Cluster Name > Cluster name / Active Chains > Active chains

FIGMA

Related tasks:

• Icon for Name services lookup FIGMA

Attached