docs: Update install instructions to rename binary before moving

The install instructions in the README were updated to first rename the downloaded binary to `aicommit` before moving it to `/usr/local/bin/`. This makes the instructions more consistent and easier to follow.

readme.md

@@ -106,19 +106,26 @@ Available builds:
 # 1. Download and extract (replace VERSION and ARCH with appropriate values)
 # wget https://github.com/suenot/aicommit/releases/download/vVERSION/aicommit-<ARCH>
 # chmod +x aicommit-<ARCH>
-# sudo mv aicommit-<ARCH> /usr/local/bin/
+# mv aicommit-<ARCH> aicommit
+# sudo mv aicommit /usr/local/bin/
+
 # Example for Linux x86_64:
 wget https://github.com/suenot/aicommit/releases/download/v0.1.72/aicommit-linux-x86_64
-chmod +x aicommit-linux-x86_64
-sudo mv aicommit-linux-x86_64 /usr/local/bin/
+mv aicommit-linux-x86_64 aicommit
+chmod +x aicommit
+sudo mv aicommit /usr/local/bin/
+
 # Example for macOS ARM64:
 wget https://github.com/suenot/aicommit/releases/download/v0.1.72/aicommit-macos-aarch64
-chmod +x aicommit-macos-aarch64
-sudo mv aicommit-macos-aarch64 /usr/local/bin/
+mv aicommit-macos-aarch64 aicommit
+chmod +x aicommit
+sudo mv aicommit /usr/local/bin/
+
 # Example for macOS x86_64:
 wget https://github.com/suenot/aicommit/releases/download/v0.1.72/aicommit-macos-x86_64
-chmod +x aicommit-macos-x86_64
-sudo mv aicommit-macos-x86_64 /usr/local/bin/
+mv aicommit-macos-x86_64 aicommit
+chmod +x aicommit
+sudo mv aicommit /usr/local/bin/
 
 
 # 2. Make it executable