Use height=400 for README images

Normalize image sizing in the README table: replace the App Icon markdown image with an HTML <img> tag using height=400 and change the History image from width=300 to height=400. Cosmetic documentation change to keep visuals consistent.

Author: 1998code

README.md

@@ -93,7 +93,7 @@ That's it — SwiftNEW auto-triggers when the app version changes.
 
 | App Icon (3.9.6+) | History (2.0+) |
 |:-----------------:|:--------------:|
-| ![App Icon](https://user-images.githubusercontent.com/54872601/206886933-bc4d0d33-e0fc-4013-9456-f19679b10f5b.png) | <img width="300" alt="History" src="https://user-images.githubusercontent.com/54872601/178129999-ad63b0ce-d65e-4d86-9882-37a5090e92bc.png"> |
+| <img height="400" alt="App Icon" src="https://user-images.githubusercontent.com/54872601/206886933-bc4d0d33-e0fc-4013-9456-f19679b10f5b.png"> | <img height="400" alt="History" src="https://user-images.githubusercontent.com/54872601/178129999-ad63b0ce-d65e-4d86-9882-37a5090e92bc.png"> |
 
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