Remove Coinberry listing — acquired by Bitbuy/WonderFi; accounts migrated

[devdavidejesus]

Companion to #4684

Evidence

The listed URL https://coinberry.com/ currently redirects (HTTP 301 → 302) to https://bitbuy.ca/en-ca.

Acquisition by Bitbuy/WonderFi (Jul 2023)

WonderFi/Bitbuy acquired Coinberry's client accounts in July 2023. Coinberry users were migrated to Bitbuy and the Coinberry brand was retired.

• WonderFi press release: https://www.wonder.fi/press-release/wonderfi-announces-proposed-transaction-for-bitbuy-to-acquire-coinberry-client-accounts
• SEC filing: https://www.sec.gov/Archives/edgar/data/0001882839/000110465922092982/tm2220521d1_ex99-121.htm

Bitbuy is itself already listed under Canada on bitcoin.org/en/exchanges, so no replacement is needed.

Criterion

Per docs/adding-exchanges.md, "Site functionality" is the first review criterion. A listed URL that redirects to a different exchange (acquirer) — nearly three years after the acquisition completed — fails that criterion.

Reproduction

curl -sIL https://coinberry.com/ | head -20

The first response shows HTTP/2 301 with location: https://bitbuy.ca/, followed by HTTP/2 302 and finally HTTP/2 200 on the Bitbuy /en-ca page.