[Feature Request]: Add a CTA button at the bottom of the side help menu.

Currently, the side help menu doesn’t have any feedback function. I think it would be great if we have a CTA button that encourages users to update the node docs together.

Very similar to the `Suggest edits` button on docs.comfy.org.

When users click on the button, it will open GitHub

## For the custom node packs

I don't know if it's possible. Every custom node seems to have a `pyproject.toml` file, including their repo url. If the node docs are custom node docs, we may be able to use the repo links in the `pyproject.toml`.

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-4130-Feature-Request-Add-a-CTA-button-at-the-bottom-of-the-side-help-menu-20f6d73d3650816892f9cdf31cafb061) by [Unito](https://www.unito.io)