fix: replace port 5000 in example docs with port 6000

macOS runs a service on port 5000 by default. this doesn't actually
prevent the backend server from *starting*, or the rate limiter proxy
from working, but it *does* mean that when the backend restarts, if the
proxy sends a request, it will stop working until it's restarted.

the easiest way to work around this is by just changing the port the
backend listens on. this does not change the ports used in the docker
configuration.

Foxnouns.Backend/config.example.ini

@@ -1,7 +1,7 @@
 ; The host the server will listen on
 Host = localhost
 ; The port the server will listen on
-Port = 5000
+Port = 6000
 ; The base *external* URL
 BaseUrl = https://pronouns.localhost
 ; The base URL for media, without a trailing slash. This must be publicly accessible.

Foxnouns.Frontend/.env.example

@@ -1,7 +1,7 @@
-# Example .env file--DO NOT EDIT
+# Example .env file--DO NOT EDIT, copy to .env or .env.local then edit
 PUBLIC_LANGUAGE=en
 PUBLIC_BASE_URL=https://pronouns.cc
 PUBLIC_SHORT_URL=https://prns.cc
 PUBLIC_API_BASE=https://pronouns.cc/api
 PRIVATE_API_HOST=http://localhost:5003/api
-PRIVATE_INTERNAL_API_HOST=http://localhost:5000/api
+PRIVATE_INTERNAL_API_HOST=http://localhost:6000/api

rate/proxy-config.example.json

@@ -1,6 +1,6 @@
 {
     "port": 5003,
-    "proxy_target": "http://localhost:5000",
+    "proxy_target": "http://localhost:6000",
     "debug": true,
     "powered_by": "5 gay rats"
 }