Adding URLs from notes to r tags

[cxplay]

Normally the r tag is used to hold the relay URL, but clients such as Amethyst put the URL into the r tag in kind:1. This can be used as a search feature by using a filter to filter the tag from the relay.

https://njump.me/nevent1qqsytppyu2my7qcz9pk5wm0yp372rchef6sacep39u37j00u42h8vpqpz3mhxue69uhh2uewdehhxarj9emkjmn99upzq3svyhng9ld8sv44950j957j9vchdktj7cxumsep9mvvjthc2pjuqvzqqqqqqym279dk