feat: add books icon and update service icon reference

Added a new 'books' icon SVG file to the asset directory to enhance the icon set. Updated the icon reference in services.json from 'book' to 'books' for better visual representation and icon alignment. This change improves the visual consistency and clarity in the service icons.

assets/dist/icons/books.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" fill="#000000" viewBox="0 0 256 256"><path d="M231.65,194.55,198.46,36.75a16,16,0,0,0-19-12.39L132.65,34.42a16.08,16.08,0,0,0-12.3,19l33.19,157.8A16,16,0,0,0,169.16,224a16.25,16.25,0,0,0,3.38-.36l46.81-10.06A16.09,16.09,0,0,0,231.65,194.55ZM136,50.15c0-.06,0-.09,0-.09l46.8-10,3.33,15.87L139.33,66Zm6.62,31.47,46.82-10.05,3.34,15.9L146,97.53Zm6.64,31.57,46.82-10.06,13.3,63.24-46.82,10.06ZM216,197.94l-46.8,10-3.33-15.87L212.67,182,216,197.85C216,197.91,216,197.94,216,197.94ZM104,32H56A16,16,0,0,0,40,48V208a16,16,0,0,0,16,16h48a16,16,0,0,0,16-16V48A16,16,0,0,0,104,32ZM56,48h48V64H56Zm0,32h48v96H56Zm48,128H56V192h48v16Z"></path></svg>

data/services.json

@@ -284,7 +284,7 @@
                     "url": "https://biblioreads.private.coffee"
                 }
             ],
-            "icon": "book",
+            "icon": "books",
             "exclude_from_index": false,
             "exclude_from_simple": false
         },