Add highlight for lyric

Feature requests
1

I’ve prepare a PR for highlight lyric.

The final effect can be previewed from this link: https://zola-mikoto.netlify.com/test-lrc/

There will also be an adapted theme, I haven’t debugged since the theme needs to recompile zola. This theme is no error on sublime3

And what document content do I need to modify?

Code changes

(Delete or ignore this section for documentation changes)

  • [no] Are you doing the PR on the next branch?

If the change is a new feature or adding to/changing an existing one:

  • [no] Have you created/updated the relevant documentation page(s)?