ref links aren't styled consistently

[nixjdm]

Notably, there are many links on the plugins pages that have class="ref", where the intended style font-style: italic; is not being applied. I believe that only works right now on docs pages. A number of links don't stand out well because of this.

[nixjdm]

E.g. Compare the links on these pages

• https://www.getlektor.com/docs/api/plugins/events/after-build/
• https://www.getlektor.com/plugins/tag/after-build/

[3kori]

Please assign me this issue. Thank you.

[dairiki]

@3kori Thank you for your offer to help! Please note that PRs are always entertained, whether or not you've been "assigned" an issue.

[dairiki]

If anyone is going to put significant effort and thought into this:

It seems that our markdown-link-classes code should be able to automatically distinguish between internal and external links (based on the absence or presence of a netloc in the link URL, respectively) and automatically apply the correct class(es) to the link.

(If, for some reason, that's not the case, we could use some sort of (meta) documentation (for lektor-website authors) regarding when to use what link classes.)