PR for Privoxy (Prowlarr reverse proxy) (#152)

privoxy/README.md

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+# Privoxy
+
+[Privoxy](https://www.privoxy.org) is a simple HTTP/S reverse proxy for Prowlarr and other *arr apps using the already existing VPN container.  
+Tested with PIA VPN, other modifications might be necessary depending on your provider.  
+
+
+## Installation
+
+Enable Privoxy by setting `COMPOSE_PROFILES=privoxy`.  
+
+To enable it on Prowlarr, head to Settings > Indexers > Http.  
+Add "vpn" as host, 8118 as port, give it a tag/label, then click on "test".  
+Once working, add the tag/label to each indexer to proxy your connection through the VPN/VPN container.  

privoxy/docker-compose.yml

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+services:
+  privoxy:
+    image: vimagick/privoxy
+    container_name: privoxy
+    network_mode: "service:vpn"
+    restart: always
+    healthcheck:
+      test: ["CMD", "wget", "-qO-", "http://127.0.0.1:8118"]
+      interval: 30s
+      retries: 5
+      start_period: 10s
+      timeout: 5s
+    depends_on:
+      vpn:
+        condition: service_healthy
+    profiles:
+      - privoxy