Don't rely on relative path for docs preprocessor (#16883)

Reapplies #16700 with a corrected command. Now it no longer relies on a
relative path.

Thanks @maxdeviant for the quick help 🙏 

Release Notes:

- N/A
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@ -10,6 +10,13 @@ To preview the docs locally you will need to install [mdBook](https://rust-lang.
mdbook serve docs
```
## Preprocessor
We have a custom mdbook preprocessor for interfacing with our crates (`crates/docs_preprocessor`).
If for some reason you need to bypass the docs preprocessor, you can comment out `[preprocessor.zed_docs_preprocessor]
` from the `book.toml`.:
## Images and videos
To add images or videos to the docs, upload them to another location (e.g., zed.dev, GitHub's asset storage) and then link out to them from the docs.
@ -25,4 +32,32 @@ Putting binary assets such as images in the Git repository will bloat the reposi
The table of contents files (`theme/page-toc.js` and `theme/page-doc.css`) were initially generated by [`mdbook-pagetoc`](https://crates.io/crates/mdbook-pagetoc).
Since all these preprocessor does is generate the static assets, we don't need to keep it around once they have been generated.
Since all this preprocessor does does is generate the static assets, we don't need to keep it around once they have been generated.
## Referencing Keybindings and Actions
When referencing keybindings or actions, use the following formats:
### Keybindings:
`{#kb scope::Action}` - e.g., `{#kb zed::OpenSettings}`.
This will output a code element like: `<code>Cmd+,|Ctrl+,</code>`. We then use a client-side plugin to show the actual keybinding based on the user's platform.
By using the action name, we can ensure that the keybinding is always up-to-date rather than hardcoding the keybinding.
### Actions:
`{#action scope::Action}` - e.g., `{#action zed::OpenSettings}`.
This will render a human-readable version of the action name, e.g., "zed: open settings", and will allow us to implement things like additional context on hover, etc.
### Creating New Templates
New templates can be created by implementing the `Template` trait for your desired template in the `docs_preprocessor` crate.
### References
- Template Trait: crates/docs_preprocessor/src/templates.rs
- Example template: crates/docs_preprocessor/src/templates/keybinding.rs
- Client-side plugins: docs/theme/plugins.js