Instructions and default app configuration should use generic Airflow URLs

Updated the instructions in the README, and the example entries in the
app-config.yml file to use `https://your.airflow.instance.com` instead of
`localhost:8080`.

Signed-off-by: Colton Padden <colton.padden@fastmail.com>

app-config.yaml

@@ -98,7 +98,7 @@ proxy:
       Authorization: ${ILERT_AUTH_HEADER}
 
   '/airflow':
-    target: http://localhost:8080/api/v1
+    target: https://your.airflow.instance.com/api/v1
     headers:
       Authorization: ${AIRFLOW_BASIC_AUTH_HEADER}
 
@@ -444,4 +444,4 @@ azureDevOps:
   organization: my-company
 
 apacheAirflow:
-  baseUrl: http://localhost:8080
+  baseUrl: https://your.airflow.instance.com

plugins/apache-airflow/README.md

@@ -49,7 +49,7 @@ configuration:
 ```yaml
 proxy:
   '/airflow':
-    target: http://localhost:8080/api/v1
+    target: https://your.airflow.instance.com/api/v1
     headers:
       Authorization: ${AIRFLOW_BASIC_AUTH_HEADER}
 ```