[Firebird-docs] Firebird's nbackup tool migrated

[Mark R. <ma...@la...>]

New links:
https://www.firebirdsql.org/file/documentation/html/en/firebirddocs/nbackup/firebird-nbackup.html
https://www.firebirdsql.org/file/documentation/pdf/en/firebirddocs/nbackup/firebird-nbackup.pdf

I'm not really sure what to about the translations of this nbackup 
document. All translations are outdated compared to the current 
document, maybe it is best to leave them as is for now.

Mark
-- 
Mark Rotteveel