feat: add Linux build guide and enhance make_config.yaml with detailed description and features

linux/packaging/deb/make_config.yaml

@@ -15,6 +15,20 @@ essential: false
 
 icon: assets/icon/logo.png
 
+description:
+  short: Beautiful, Fast and Functional Audiobook Player for your Audiobookshelf server.
+  long: |
+    Vaani is a client for your (self-hosted) Audiobookshelf server.
+    
+    Features:
+    - Functional Player: Speed Control, Sleep Timer, Shake to Control Player
+    - Save data with Offline listening and caching
+    - Material Design
+    - Extensive Settings to customize every tiny detail
+    
+    Note: you need an Audiobookshelf server setup for this app to work.
+    Please see https://www.audiobookshelf.org/ on how to setup one if not already.
+
 postuninstall_scripts:
   - echo "Sorry to see you go."
 
@@ -26,8 +40,9 @@ keywords:
 generic_name: Audiobook Player
 
 categories:
-  - Media
-  - Utility
+  - AudioVideo
+  - Audio
+  - Player
 
 startup_notify: true