ARROW-15895: [R] R docs version switcher disappears & reappears with back button on Chrome
ARROW-15895: [R] R docs version switcher disappears & reappears with back button on Chrome

Closes #12846 from thisisnic/ARROW-15895_version_switcher

Authored-by: Nic Crane <b130ca97a5c118d9797a8d384d7c894a28655aef@gmail.com>
Signed-off-by: Nic Crane <b130ca97a5c118d9797a8d384d7c894a28655aef@gmail.com>

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