Same-document hyperlinks support

[gridlocdev]

When using a link to another place in the same markdown document, the published Listed site reloads the page at the root level (with the link tag appended to the url) instead of navigating the page scroll to the appropriate tag on the page:

[Link to Header](#example-header)

# Example Header

[gridlocdev]

I've done some testing myself while playing around with SSG, and it's likely to do with how same-document hyperlinks navigate.

Here's a related Issue that explains it better: github/cmark-gfm#186

In short, same-document hyperlinks with the # prefix target elements by ID, and the Listed generated header tags like h1, h2 etc; do not get generated with any ID attributes.

In the example I put in the comment above, the HTML that would get generated to enable same-document hyperlinks would look like:

<a href="...#example-header">Link to Header</a>

<h1 id="example-header">Example Header</h1>

[dewcked]

I felt uncomfortable, so I made a tampermonkey userscript for this function.

https://gist.github.com/dewcked/4f53f75a1563011dabfbcb2546029df0#file-listed-to-enhanced-markdown-links-js

This function adds distinct id (with naming convention example-header) and chain to each heading. Chain works same as github's.

still, it is not 100% compatible with markdown heading-to-elementId rule. I'm searching for heading-to-elementId sanitization rule.