Enabling HTTP to HTTPS redirects

**If the issue is a feature request, what is the motivation / use case for it?**

Having one command to serve a fully fledged SPA.

**Other information (related issues, suggestions for a fix, etc):**
Being able to use two ports and http-redirect from one to another would be a big help.

Example: `npx http-server -S -K ... -C .... -p 80,443 --https-redirect`