Option to keep TOC visible

[pbxqdown]

Summary

An option to keep toc visible when browsing long post.

Motivation

For long articles, toc only displays at the top of page. It would be inconvenient to navigate between sections if toc is not always visible.

Drawbacks

[iBug]

https://mmistakes.github.io/minimal-mistakes/docs/helpers/#enabled-via-yaml-front-matter

[pbxqdown]

Thanks! Sorry i don't why i ignored the section when i read the docs...

[gricn]

@iBug Minimal mistakes' Guidance needs to improve.
Layouts page doesn't have "toc_sticky" parameter. This problem also confused me for a long time.