Feature/event notifications (#399)

* additional server events

* sort 'recent recipes' by updated

* remove duplicate code

* fixes #396

* set color

* consolidate tag/category pages

* set colors

* list unorganized recipes

* cleanup old code

* remove flash message, switch to global snackbar

* cancel to close

* cleanup

* notifications first pass

* test notification

* complete notification feature

* use background tasks

* add url param

* update documentation

Co-authored-by: hay-kot <hay-kot@pm.me>

frontend/src/locales/messages/en-US.json

@@ -31,6 +31,16 @@
     "category-updated": "Category updated",
     "uncategorized-count": "Uncategorized {count}"
   },
+  "events": {
+    "notification": "Notification",
+    "apprise-url": "Apprise URL",
+    "subscribed-events": "Subscribed Events",
+    "scheduled": "Scheduled",
+    "database": "Database",
+    "test-message-sent": "Test Message Sent",
+    "something-went-wrong": "Something Went Wrong!",
+    "new-notification-form-description": "Mealie uses the Apprise library to generate notifications. They offer many options for services to use for notifications. Refer to their wiki for a comprehensive guide on how to create the URL for your service. If available, selecting the type of your notification may include extra features."
+  },
   "general": {
     "apply": "Apply",
     "cancel": "Cancel",
@@ -55,6 +65,7 @@
     "file-uploaded": "File uploaded",
     "filter": "Filter",
     "friday": "Friday",
+    "general": "General",
     "get": "Get",
     "image": "Image",
     "image-upload-failed": "Image upload failed",
@@ -70,6 +81,7 @@
     "random": "Random",
     "rating": "Rating",
     "recent": "Recent",
+    "recipe": "Recipe",
     "recipes": "Recipes",
     "rename-object": "Rename {0}",
     "reset": "Reset",
@@ -88,6 +100,8 @@
     "thursday": "Thursday",
     "token": "Token",
     "tuesday": "Tuesday",
+    "type": "Type",
+    "test": "Test",
     "update": "Update",
     "updated": "Updated",
     "upload": "Upload",