chore: use nginxproxy's DockerHub registry

Transitioning away from jwilder/nginx-proxy
Please see #1304 for more details

test/stress_tests/test_deleted_cert/docker-compose.yml

@@ -8,7 +8,7 @@ web:
 
 
 reverseproxy:
-  image: jwilder/nginx-proxy:test
+  image: nginxproxy/nginx-proxy:test
   container_name: reverseproxy
   environment:
     DEBUG: "true"

test/stress_tests/test_unreachable_network/README.md

@@ -6,7 +6,7 @@ Furthermore, if the nginx-proxy in such state is restarted, the nginx process wi
 
 In the generated nginx config file, we can notice the presence of an empty `upstream {}` block.
 
-This can be fixed by merging [PR-585](https://github.com/jwilder/nginx-proxy/pull/585).
+This can be fixed by merging [PR-585](https://github.com/nginx-proxy/nginx-proxy/pull/585).
 
 ## How to reproduce
 

test/stress_tests/test_unreachable_network/docker-compose.yml

@@ -9,7 +9,7 @@ services:
     container_name: reverseproxy
     networks:
       - netA
-    image: jwilder/nginx-proxy:test
+    image: nginxproxy/nginx-proxy:test
     volumes:
       - /var/run/docker.sock:/tmp/docker.sock:ro