You really should learn that skill because it's very important in most software companies, and mandatory for some fields like the healthcare industry. It is, like unit-tests or code coverage, a skill that makes a difference between a developer and a senior developer.
Also my pain point is when documentation is not written when it's so easy to use nowadays with files in a docs/ directory, wikis, or comments like Doxygen. We don't need more tools, we need discipline. I'm still trying to understand what your service could bring me, and why I would pay for this.
Last but not least, in the comparison page (https://documentationlab.com/blog/best-software-documentatio...), you describe Read the docs as a tool when it's only a web site to store user-generated content (from Sphinx or any other tool). That's why it's more confusing.