message: docs: Fix README links to docs
  Fixes
diff: @@ -9,7 +9,7 @@ is developed alongside, and primarily for, RedoxOS, it is a fully capable on oth
  [![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE)
  [![crates.io](https://meritbadge.herokuapp.com/ion-shell)](https://crates.io/crates/ion-shell)
  -[![Documentation](https://img.shields.io/badge/documentation-blue)](https://doc.redox-os.org/ion-manual/html)
  +[![Documentation](https://img.shields.io/badge/documentation-blue)](https://doc.redox-os.org/ion-manual)
  > Ion is still a WIP, and both its syntax and rules are subject to change over time. It is
  > still quite a ways from becoming stabilized, but we are getting very close. Changes to the
  @@ -25,7 +25,7 @@ yet to be written into the specification.
  # Ion Manual
  -[The Ion manual online](https://doc.redox-os.org/ion-manual/html)
  +[The Ion manual online](https://doc.redox-os.org/ion-manual)
  is generated automatically on each commit via [mdBook](https://github.com/azerupi/mdBook) and hosted on Redox OS's website.
  **Building the manual for local reference**
  