Dockerfile: remove unnecessary yq and add wget

This commit:

* Removes yq from the Dockerfile
* Adds wget to implement some health checks.

Dockerfile

@@ -3,6 +3,6 @@ FROM nginx:stable
 COPY src/ /usr/share/nginx/html/datahangar
 COPY conf/datahangar.conf /etc/nginx/conf.d/default.conf
 
-RUN apt-get update && apt-get install -y yq &&  apt-get -y clean && \
+RUN apt-get update && apt-get install -y wget &&  apt-get -y clean && \
   rm -rf /var/lib/apt/lists/*
 RUN chown nginx:nginx /usr/share/nginx/html/datahangar -R