Changes after moving to @libp2p

[AlanSl]

Before transfer:

• [x] Point all packages at @libp2p/{package} instead of @nearform/{package}
• [x] Edit links and settings pointing to GitHub URLs
• [x] Rebase after merging https://github.com/nearform/libp2p-observer/pull/68
• [x] Check, rebase and update after subsequent PRs are merged

After transfer:

• [x] Regenerate yarn.lock
• [x] If necessary, rename READ_PACKAGES_TOKEN in .github/workfows/test

[AlanSl]

With the latest commits:

• [x] All tests are passing locally
• [x] Local builds work fine
• Github Actions CI is inactive, because this is a private repo on a free account - will return when the repo goes public. So you'll have to take my word for it that the tests pass instead of having the green ✔️