metadata-function-map link is "404 not found" in docs

### Product

axe-core

### Product Version

current live version at https://www.deque.com/axe/core-documentation/api-documentation

### Latest Version

- [x] I have tested the issue with the latest version of the product

### Issue Description

#### Expectation

There are two links in the API docs that state:
> See the [`metadata-function-map`](https://www.deque.com/axe/core-documentation/lib/core/base/metadata-function-map.js) file for all defined IDs.

The latest tagged version I found in this repo is:
https://github.com/dequelabs/axe-core/blob/v4.4.1/lib/core/base/metadata-function-map.js

#### Actual
Switching to tag `v4.4.2` or `develop`, it's gone:
https://github.com/dequelabs/axe-core/blob/develop/lib/core/base/metadata-function-map.js
> 404 - page not found

I saw something in the history (#3392) suggesting this might have been refactored/auto-generated.

#### How to Reproduce
Click the links to `metadata-function-map` in the live documentation.

#### Additional context
If auto-generated during build, would be good if it could still be available:
- in the live docs
- in the repo, or a placeholder file that says it's autogenerated at build time, perhaps with a link to the live docs.