Roadmap: the site's address is omnipython.org

The site bullet said the PyDevices domain; the portal moves to omnipython.org. The firmware-page bullet now matches the plain style of the one above it. Docs only.

Author: bdbarnett

ROADMAP.md

@@ -5,11 +5,10 @@ packages it describes, so most of its changes arrive with theirs.
 
 ## Next
 
-- The site moves to the PyDevices domain, with the documentation, the package
-  index, the examples and workbench each at their own address beside it.
-- **Install your own build from the firmware page.** "Install from a file"
-  takes a `.bin` you built and writes it to your board from Chrome or Edge,
-  the way the page installs the released images.
+- The site moves to omnipython.org, with the documentation, the package index
+  and the gallery each at their own address beside it.
+- Install your own build from the firmware page: "Install from a file" takes a
+  `.bin` you built and writes it to your board from Chrome or Edge.
 
 Something wrong or missing on the site? Open an
 [issue](https://github.com/PyDevices/PyDevices.github.io/issues).