What are my options if my site doesn't use index.html (Handlebars.js)

So my website uses Handlebars for templating and as such all my HTML files are .hbs. There’s trouble deploying the site because of the lack of index.html. Currently I am looking into making an index.html that links to what I need but am having trouble making it work.

What’s the most pragmatic solution is here?

Repo:

Deployment:
https://crosswordia.netlify.app/

Closed as OP reposted in What are my options for making a Handlebars-Express project with no index.html netlify compatible?