Clean up double blank lines and finish Matewawe→Matewave rename

Removed stray duplicate blank lines in README and a trailing space
in the <h1> tag. Updated remaining Matewawe references (icon alt
text, LICENSE notices, CHANGELOG repo links) to Matewave to match
the renamed repository — actual release asset filenames
(Matewawe-vX.X.X.apk) are left untouched since they were already
uploaded under the old name.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015g6ECVSKcBG8CJPrqC3G5o

LICENSE

@@ -631,8 +631,8 @@ to attach them to the start of each source file to most effectively
 state the exclusion of warranty; and each file should have at least
 the "copyright" line and a pointer to where the full notice is found.
 
-    Matewawe
-    Copyright (C) 2026  Matewawe contributors
+    Matewave
+    Copyright (C) 2026  Matewave contributors
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -652,7 +652,7 @@ Also add information on how to contact you by electronic and paper mail.
   If the program does terminal interaction, make it output a short
 notice like this when it starts in an interactive mode:
 
-    Matewawe  Copyright (C) 2026  Matewawe contributors
+    Matewave  Copyright (C) 2026  Matewave contributors
     This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
     This is free software, and you are welcome to redistribute it
     under certain conditions; type `show c' for details.