Revert "Delete all category background images"

This reverts merge request !24312

config/categories.yml

@@ -11,8 +11,10 @@ Calendar & Agenda:
 Cloud Storage & File Sync:
   name: Cloud Storage & File Sync
 Connectivity:
+  icon: category_connectivity.png
   name: Connectivity
 Development:
+  icon: category_development.png
   name: Development
 DNS & Hosts:
   name: DNS & Hosts
@@ -31,12 +33,15 @@ Finance Manager:
 Gallery:
   name: Gallery
 Games:
+  icon: category_games.png
   name: Games
 Graphics:
+  icon: category_graphics.png
   name: Graphics
 Icon Pack:
   name: Icon Pack
 Internet:
+  icon: category_internet.png
   name: Internet
 Keyboard & IME:
   name: Keyboard & IME
@@ -47,10 +52,12 @@ Local Media Player:
 Messaging:
   name: Messaging
 Money:
+  icon: category_money.png
   name: Money
 Multimedia:
   name: Multimedia
 Navigation:
+  icon: category_navigation.png
   name: Navigation
 News:
   name: News
@@ -69,12 +76,15 @@ Podcast:
 Public Transport Map & Timetable:
   name: Public Transport Map & Timetable
 Reading:
+  icon: category_reading.png
   name: Reading
 Recipe Manager:
   name: Recipe Manager
 Science & Education:
+  icon: category_science_education.png
   name: Science & Education
 Security:
+  icon: category_security.png
   name: Security
 Shopping List:
   name: Shopping List
@@ -83,12 +93,14 @@ Social Network:
 Sports & Health:
   name: Sports & Health
 System:
+  icon: category_system.png
   name: System
 Task:
   name: Task
 Text Editor:
   name: Text Editor
 Theming:
+  icon: category_theming.png
   name: Theming
 Time:
   name: Time
@@ -109,4 +121,5 @@ Weather:
 Workout:
   name: Workout
 Writing:
+  icon: category_writing.png
   name: Writing