docs: add Chain.Love Celo API directory

[Adisaok]

The hole and the fix

The hosted RPC documentation lists individual Celo RPC providers, but does not provide a neutral infrastructure-discovery directory for developers who want to shortlist available options.

This PR adds the Celo-specific Chain.Love API directory to the hosted RPC documentation and provides brief guidance to compare provider requirements before selecting a service.

The change adds documentation only; it does not modify any existing provider entry or application behavior.

What this does NOT do / residual risk

• It does not add or endorse a specific RPC provider.
• It does not guarantee provider availability, pricing, archive access, network support, or request limits.
• Chain.Love directory information can become outdated, so the documentation explicitly directs users to verify current details in the provider's own documentation.

Judgement calls

• Uses the Celo-specific Chain.Love directory (https://celo.chain.love/toolbox/apis) rather than the generic Chain.Love homepage so the resource is directly relevant to this page.
• Places the addition immediately before the existing provider entries in the hosted RPC section.
• No product or functional changes are included.

Issues

Closes #
Refs #

Stacking / Conflicts

Branched directly from the current main branch and contains an independent documentation change.

No application code, shared interfaces, or runtime behavior are affected.

Verification evidence

• git diff --check — passed.
• mint broken-links — success no broken links found.
• curl -I -L --max-time 20 https://celo.chain.love/toolbox/apis — HTTP 200.
• Final diff: tooling/nodes/overview.mdx, 4 insertions, 0 deletions.
• No existing Chain.Love reference was present in the target file before this change.
• mint dev was not used as a blocking verification step for this documentation-only change.

Remaining ops steps

• none

Checklist

• Title is the commit message intended for main
• Documentation change is limited to the requested RPC-provider discovery addition
• No unrelated files or changes
• Link to the Celo-specific Chain.Love directory verified
• Broken-link check passes
• No secrets in the diff
• Judgement calls are documented above
• No issue is being closed by this PR

Questions for the maintainer: none

Disclosure

Disclaimer: This contribution was prepared through the incentivised Chain.Love community integration program](Chain-Love/chain-love#2691) and reviewed by a Chain.Love program maintainer.