Direct wget output in Docker healthcheck to stdout

wget's default behavior to download contents to a file is not always a
valid method to use as a Docker healthcheck, due to permission issues.
This circumvents any issues there by redirecting the healthcheck output
to stdout, which shouldn't cause any issues regardless of context.

Fixes #272

Dockerfile

@@ -68,6 +68,6 @@ COPY whoogle.env .
 EXPOSE $EXPOSE_PORT
 
 HEALTHCHECK  --interval=30s --timeout=5s \
-  CMD wget --no-verbose --tries=1 http://localhost:${EXPOSE_PORT}/ || exit 1
+  CMD wget -qO- --no-verbose --tries=1 http://localhost:${EXPOSE_PORT}/ || exit 1
 
 CMD misc/tor/start-tor.sh & ./run