Use url_for function on templates to resolve static files

[rochacbruno]

Discussed in #263

^{Originally posted by r3k2 May 4, 2025}
Hello I have a Gemini/HTTP gemlog and inside there I have a folder for marmite for a sub blog were I do need to have pictures, I got it all to work but one thing... only works if I navigate to https://mysite.org/subsite/ but if I go to https://mysite.org/subsite then is missing CSS and needed things, I though about just adding some js to custom.js to redirect to subsite/index.html from subsite if someone happends to type it with out the trailing "/" any suggestions?

Thank you!