FR add support for images relative to root (starting with /)

[hidegh]

The solution uses this plugin, but one of the MD does reference an image from the assets, so relatively from root, via: /assets/img/wrong-way.jpg

This makes the build fail, du to the plugin:

`Error` was thrown:
    Error: [Eleventy-Plugin-Page-Assets] Cannot resolve asset "/assets/img/wrong-way.jpg" in "_site/posts/DDD Series - 2 - The history of DDD/index.html" from template "./src/posts/programming/2021-01-05-ddd-series/02/index.md"!
        at C:\$_Work\11ty-custom\node_modules\eleventy-plugin-page-assets\src\plugin.js:80:21

It also results in the MD file not being translated to HTML.

1. FR: please add support to use images relative to root (starting with /)
2. BUG: probably a try/catch around the plugin logic would be desirable, so that at least the HTML content gets properly generated (even with a broken IMG link) - still better than having nothing
3. NOTE: IMO after the const / let issue (see PR fix variable assignment error #2) using directory mode would be probably the best way to approach extra content along the posts (MD files)

11ty-custom.zip

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Additionally: when using permalinks post/{title} and fixing the const / let issue in the plugin and using any img copy over, I end up with a weird structure:

The entire source is attached to play with (debug)...