implemented apprise notifications + readme updates

.github/workflows/docker.yml

@@ -36,7 +36,7 @@ jobs:
         with:
           # list of Docker images to use as base name for tags
           images: |
-            jokobsk/pi.alert
+            jokobsk/pi.alert_dev
           # generate Docker tags based on the following events/attributes
           tags: |
             type=raw,value=latest