The answer is although iOS seems like it can do anything a Mac can there are great restrictions in the iOS environment. Apples own high-end products like Xcode and Logic Pro X can’t run on an iOS machine.
This has been covered:
As for content being updated, there are all kinds of CMS options available. You would need to set up the RW site first, and then “content” could be changed via almost anything that has a web browser.
Would suggest you do a few searches on the Forum.