offline store doc page is 404

## Expected Behavior 

## Current Behavior
the url https://github.com/feast-dev/feast/blob/v0.40-branch/docs/reference/offline-stores/file.md in this [page]( https://docs.feast.dev/reference/offline-stores) is 404


## Steps to reproduce

### Specifications

- Version:
- Platform:
- Subsystem:

## Possible Solution
