x/website: show anchor links for article headings

[hyangah]

Reveal anchor links to headings, so users can copy the link to the specific part of the doc easily.

Before

After - the "¶" symbol appears when hover. On Chrome, right click on it will show the context menu so users can operate on the anchor link.

[gopherbot]

Change https://go.dev/cl/601055 mentions this issue: _content: add anchor links to article headers

[matttproud]

@hyangah, thank you so much for doing this! The lack of this has bothered me for years and caused me to open up the inspector for each heading's ID to deep link to blog article sections! I am elated I no longer have to do this.

[gopherbot]

Change https://go.dev/cl/618635 mentions this issue: _content/js: generate TOC items before adding anchor links

[mvdan]

I'm just here to echo what @matttproud said, this is amazing! I just created the anchor link https://go.dev/doc/comment#doclinks manually because I've been doing this for years and it didn't even occur to me that this got fixed 🙇

[mvdan]

@hyangah just one request - when I hover over "Doc Links", nothing happens - which is why I didn't even realise this got fixed earlier today. I have to move my cursor to the right of the heading - where the "reverse P" anchor symbol would be - for it to appear, as if I had to know ahead of time it would be there.

Can we make the anchor link show up whenever I hover over any of the heading area too? I think this is how anchor link hovers usually work on other websites, or at least that's how I intuitively think they work.

[gopherbot]

Change https://go.dev/cl/619015 mentions this issue: _content/blog: don't load godocs.js (and other scripts) more than once