Although I have never done this myself, I’m pretty sure Steam will accept an executable file, so after running the tools you would drag and drop the folder or something like that. Not much different to uploading a game executable generated by Unity or Godot, although those may have built in integrations / support to make it even easier. @randomuser is planning to put Hebes onto Steam with the MakeCode-Arcade-to-App tool!
About the community site…I’ve been brainstorming a lot but I’d probably need to ask the forum moderators to see what’s ok and not ok, as I also desire that the website will be linked to from these forums, at least for extensions and tools. (Because it will definitely link back to the forums)