feat: remove ruby (#20)

Argcfile.sh

@@ -9,7 +9,6 @@ LANG_CMDS=( \
     "sh:bash" \
     "js:node" \
     "py:python" \
-    "rb:ruby" \
 )
 
 # @cmd Call the function
@@ -142,7 +141,6 @@ test-functions() {
         'sh#may_execute_command#{"command":"echo \"✓\""}' \
         'js#may_execute_js_code#{"code":"console.log(\"✓\")"}' \
         'py#may_execute_py_code#{"code":"print(\"✓\")"}' \
-        'rb#may_execute_rb_code#{"code":"puts \"✓\""}'  \
     )
 
     for test_case in "${test_cases[@]}"; do