add btcpayserver to tools page

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[plowsof]

They actually link to Seth's guide for deployment on this page here https://docs.btcpayserver.org/FAQ/Altcoin/ which is a shock (considering their previous hostility)

recent security flaw they fixed https://monero.observer/btcpayserver-1.6.1-release-fixes-critical-bug-altcoins-integration/ (i just wonder, if they 'care' about 'altcoins'/'shitcoins' enough)