Provide complete docs as single-file download to put into LLM context windows

### Preflight Checklist

- [x] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/main/CONTRIBUTING.md) for this project.
- [x] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/main/CODE_OF_CONDUCT.md) that this project adheres to.
- [x] I have searched the [issue tracker](https://www.github.com/electron/electron/issues) for a feature request that matches the one I want to file, without success.

### Problem Description

It would be nice to have a single file that includes all of our docs so that we can throw it into LLM context windows.

Inspired by:


### Proposed Solution

Create a single huge markdown file that is all of the other markdown files from our project concatenated.

Publish it as an additional file for each GitHub release. (Thanks to @erickzhao for the idea of attaching it to releases!)

Follow-up task: Link to it from `electron/website`.

### Alternatives Considered

Have LLMs search the Electron website instead. Not efficient. Doesn't work super well as of now.

### Additional Information

Working prototype (script created entirely by ChatGPT): [generateDocs.ts.txt](https://github.com/user-attachments/files/20717859/generateDocs.ts.txt)

This generates this 1.6MB markdown file.

#### How well does it work?

I put the output into ChatGPT and asked about a new feature that isn’t in the training data of the model yet. I picked macOS writing tools.

- GPT-4o couldn’t tell me how to add writing tool support.
- o4-mini, however, did find the right answer in the docs.