fix: remove misleading explorer metrics

[andrewnguyen22]

Summary

• remove the Liquid Supply card from the explorer dashboard
• remove liquid supply values and the liquid distribution segment from the Network Supply page
• remove Total Accounts from the dashboard and stop its now-unneeded account-count request
• remove the corresponding stale explorer data-config entries

Rationale

Liquid supply is derived as total supply minus staked supply, which can misrepresent the amount that is actually liquid. The account total is also no longer wanted in the dashboard overview.

Validation

• npm run build — passes
• npx eslint src/components/Home/Stages.tsx src/components/staking/SupplyView.tsx — passes
• npm run lint — currently fails on five pre-existing errors in ValidatorsPage.tsx, api.ts, and utils.ts; no lint errors are reported in the changed files

Screenshots

Not included; this is a removal-only UI change.

Compatibility

No chain.json or manifest.json changes.