Remove remenants of old file files from `dist` branch

[JackNoordhuis]

Although the package.json main and types fields point to the correct files, the old files have not been removed by create-pull-request step of CI.

https://github.com/NxtLvLSoftware/alpine-typescript/blob/39598c13df0da8b08484eb8ceaac00754bc3e4a4/index.d.ts

https://github.com/NxtLvLSoftware/alpine-typescript/blob/39598c13df0da8b08484eb8ceaac00754bc3e4a4/index.js

This should not cause any issues (code/IDE wise as paths are specified correctly) but will be confusing for developers browsing the source. Ideally, the create-pull-request step should deal with this automatically in the future.