Add cancel button to key edit
Merge pull request #122 from tiwilliam/cancel-edit-key

ui: Add cancel button to key edit
Add delete folder button to web UI
Revert modifications to `getParentAndGrandparent`
Redirect to correct root path when deleting keys
Clean up root check
Transition to nearest parent on key delete
Drop duplicate isLoading set to false
Rename `KvHelpController` to `KvBaseController`