Firebird ODBC documentation (English and German) is migrated to AsciiDoc

Firebird ODBC documentation (English and German) is migrated to AsciiDoc 

English:
HTML:
https://www.firebirdsql.org/file/documentation/html/en/refdocs/fbodbc20/firebird-odbc-driver-20-manual.html
PDF:
https://www.firebirdsql.org/file/documentation/pdf/en/refdocs/fbodbc20/firebird-odbc-driver-20-manual.pdf

German:
HTML:
https://www.firebirdsql.org/file/documentation/html/de/refdocs/fbodbc20/firebird-odbc-treiber-20-handbuch.html
PDF:
https://www.firebirdsql.org/file/documentation/pdf/de/refdocs/fbodbc20/firebird-odbc-treiber-20-handbuch.pdf