* fix(giscuss): system theme
* fix(giscuss): language
* fix(giscuss): theme switching
* chore: remove confusing comment
* fix(giscuss): use a uniq ID
* chore: remove useless function
* chore: use extra language code
* chore: add comment about hash
* Update layouts/_partials/components/giscus.html
---------
Co-authored-by: Xin <5097752+imfing@users.noreply.github.com>