EDIT: The site itself works now, so I "only" need help with nginx :-)
EDIT: DISCARD THE FOLLOWING LINES (Strike-through doesn't seem to work):
~~BTW, I get a handful of errors when I start Lemmy :
thread 'main' panicked at 'Error connecting to postgres://lemmy:thepassword@postgres:5432/lemmy: could not connect to server: Connection refused
lemmy_1 | Is the server running on host "postgres" (172.18.0.2) and accepting
lemmy_1 | TCP/IP connections on port 5432?
I do not know at all where that 172.18.0.2 address comes from sweating :-D~~
Turbo Pascal, Go, assembler and Basic I guess :-D