This commit removes dependency on rxjs.
It also implements better composables to handle data fetching from
remote APIs and caching these values more transparently.
This commit also switches from yarn to npm
It also switches to the official Umami plugin
This commit adds the possibility to provide to the caching component data already known and to be
cached immediately without the need of a callback function. This allows caching individual
repositories without having to rely on additional API calls. However, repos can also be retrieved
individually from the GitHub API based on their full name.
