major change, i know. now i'm using ssg and rssg by roman zolotarev.
okay, well, not exactly. ssg is modified to generate pages for gemini
too. it's hard to maintain two different things simultaneously.

bye-bye jekyll!

'cause it makes more sense. also, this action made me realize that
my website is very poorly designed, because to just rename one page
i needed to make changes in 6 different files! that's really gross...
i hope i can improve it.

and modify the music-project layout to display those orphan tracks.

also fix header that was wrong.
add styles for titles with backlink.
& other changes (see diff, i'm lazy)

also snippet that makes art menu is now separated as mixin (very
powerful thing, btw).