Update Dockerfile

Dockerfile

@@ -7,7 +7,7 @@ RUN git clone -b Rel-17 https://github.com/jdegre/5GC_APIs Rel-15
 
 FROM nginx:latest as production-stage
 RUN rm -rf /etc/nginx/html
-COPY dist /etc/nginx/html
+COPY dist/index.html /etc/nginx/html/index.html
 COPY --from=build-stage /app/Rel-18 /etc/nginx/html/Rel-18
 COPY --from=build-stage /app/Rel-17 /etc/nginx/html/Rel-17
 COPY --from=build-stage /app/Rel-16 /etc/nginx/html/Rel-16