enhance: Push Notification badges to Tabler Icons (#9406)

* enhance: Push Notification badges to Tabler Icons

* add receiveFollowRequest icon

packages/backend/assets/notification-badges/LICENSE

@@ -1,5 +0,0 @@
-Font Awesome Icons
--------------------------
-
-Ⓒ Font Awesome
-CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

packages/backend/assets/tabler-badges/LICENSE

@@ -0,0 +1,24 @@
+Tabler Icons  
+https://github.com/tabler/tabler-icons/blob/master/LICENSE
+====
+MIT License
+
+Copyright (c) 2020-2022 Paweł Kuna
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.