Webpage to improve SEO and help discovery

[BrettKulp]

A static landing page on GitHub pages with install instructions, key features, and a demo similar to the readme that would show up in google results when people are searching for things similar to "Does Opencode have vim mode" could help people discover the project

[BrettKulp]

idk if this is worth it. The readme basically covers everything and not sure if a static html page with the same info will have much impact anything I could think to put on the page is already in the readme.

What I have got is in this branch which is basically the readme with some stuff added and the metadata more optimized https://github.com/BrettKulp/opencode-vim/tree/feature/webpage