- Change Galileo from app.galileo.fairdatasociety.org to GitHub repo
- Change Bchan from bzz.limo to GitHub repo
- Replace buzzMint with buzzmint.io
- Remove FairOS docs link (HTTP 502)
- Remove Sepolia test network RPC example
- Add external services to ignore list (Blockscout, gnosisscan, NPM, xdai)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

Add six documentation URLs that were included in awesome-list.mdx
but not yet registered in llms.txt for LLM indexing:
- Bee installation verification guide
- Bee node working introduction
- Swarm concepts introduction
- Development introduction
- Multi-author blog guide
- Tools and features overview

These ensure comprehensive LLM coverage of core documentation topics.

…han to GitHub, remove Galileo

- buzzMint: changed from invalid GitHub path to https://buzzmint.io/
- Bchan: updated from dead site (bchan.bzz.limo) to GitHub repo (github.com/Cafe137/bchan-public)
- Galileo: removed due to SSL handshake failure

This resolves 2 critical dead links and reduces external 404s and down sites to 0.