livereload: Inject script without head or body tag
Currently, Hugo does not inject `livereload` script if html does not contain `<head>` or `<body>`. This sometimes happens if you create new sites without `theme` and it is hard to catch the cause soon.
This PR:
* Inject livereload script even if html does not include `<head>`, `<body>`, or `<html>`
- Modern browsers execute scripts even if they are outside `<html>`
- Some js frameworks (confirmed with vite) inject HRM script without `<html>` tag
* Append warning script to html if `<head>` or `<body>` is not in html
* Fix bug that livereload cannot be appended to the tags with attrs
projects / brevno-suite / hugo / commit