When using the dev version, build exits with no such file or directory search-ui.js

I tried out the latest development version in a minimal setup using npm i https://gitlab.com/antora/antora-lunr-extension as described in the docs.

It seems that after #15 (closed) was merged, the search-ui.js is no longer available in the main branch. When the build tries to fetch it, it will fail.

One possible workaround: change to the folder node_modules\@antora\lunr-extension and run npm install and npm run build.

I wonder if this should be added to the project's README.adoc, as it advertises to use the development version. Alternatively, one could add that file to the Git repository. Maybe there are other options as well.