History mode config example for Caddy 2 webserver

[muety]

What problem does this feature solve?

!1555 has introduced a snippet to configure the Caddy web server to be compatible with vue-router's history mode. However, for version 2 of Caddy, the config directives' syntax has changed.

What does the proposed API look like?

One might either use try_files or rewrite.

[muety]

Never mind, just found that there's already a PR for it (#3215).