readme: allow copy/paste install instruction

Author: krichprollsch

README.md

@@ -38,14 +38,14 @@ Linux x86_64 and MacOS aarch64.
 
 *For linux*
 ```console
-$ wget -O lightpanda https://github.com/lightpanda-io/browser/releases/download/nightly/lightpanda-x86_64-linux
-$ chmod a+x ./lightpanda
+wget -O lightpanda https://github.com/lightpanda-io/browser/releases/download/nightly/lightpanda-x86_64-linux && \
+chmod a+x ./lightpanda
 ```
 
 *For MacOS*
 ```console
-$ wget -O lightpanda https://github.com/lightpanda-io/browser/releases/download/nightly/lightpanda-aarch64-macos
-$ chmod a+x ./lightpanda
+wget -O lightpanda https://github.com/lightpanda-io/browser/releases/download/nightly/lightpanda-aarch64-macos && \
+chmod a+x ./lightpanda
 ```
 
 ### Dump an URL