Upgrade to use latest LNBits lnurlp (post feb '23 version)

[bitkarrot]

update laiseebot to use lnurlp for lightning addresses, kill off modify well-known update to forward to LNBits lnurlp.

currently well-knowns are created for each new user on https://github.com/bitkarrot/laisee-frontpage

if we migrate to the new lnurlp (post feb 2023, see leo's test instance), we don't need to do use the laisee-frontpage for .well-known.

However, it does mean that the LN addresses are now [email protected] instead of [email protected] because the LNbits instance is at ln.laisee.org