Make maintainer-mode default to disabled

This makes the standard build instructions a bit easier,
just ./configure, and also requires less tools installed (bison).

Also i think few people probably want to generate the lexer and paser code.

Dockerfile

@@ -19,7 +19,6 @@ COPY . /app
 RUN autoreconf -i \
  && ./configure \
       --disable-docs \
-      --disable-maintainer-mode \
       --disable-valgrind \
       --with-oniguruma=builtin \
       --enable-static \