vscode: use insiders build if stable not found (#8568)

* 🔨 Add calling VS Code Insiders

* ✏️ Update README.md

plugins/vscode/vscode.plugin.zsh

@@ -1,9 +1,17 @@
 # VScode zsh plugin
-# author: https://github.com/MarsiBarsi
+# Authors:
+#   https://github.com/MarsiBarsi (original author)
+#   https://github.com/babakks
 
-# Use main Visual Studio Code version by default
-: ${VSCODE:=code}
+# Use the stable VS Code release, unless the Insiders version is the only
+# available installation
+if ! which code > /dev/null && which code-insiders > /dev/null; then
+  : ${VSCODE:=code-insiders}
+else
+  : ${VSCODE:=code}
+fi
 
+# Define aliases
 alias vsc="$VSCODE ."
 alias vsca="$VSCODE --add"
 alias vscd="$VSCODE --diff"