I am looking for an online service for composing and hosting software user manuals, with the following features:
- Cloud-based (public host), reliable for long term hosting
- Supports multiple documents with multiple sections
- Markdown syntax (preferably GitHub flavor)
- Easy bitmap uploading
- Table of contents
- Allow reader's comments
- Export to PDF (desirable)
- Can be free or low-cost
I was thinking on a markdown-based CMS but still cannot find the right one.