Revert "feat: Add compatibility for std::move function"

[matthijskooijman]

The implementation was incorrect (returning T& instead of T&&). Until a working version is provided (which requires additional work), it would be better to not provide it at all. Users that need this can use other libraries to complement ArduinoSTL with C++11 bits already, like https://github.com/hideakitai/ArxTypeTraits (and see also https://github.com/mike-matera/ArduinoSTL/pull/52#issuecomment-1170130501)

This reverts commit 75367269a46acc8304e48fcaa886a275644bf8cb.