Feature request: use filters when generating badge

[waldyrious]

Originally posted by @I60R at XAMPPRocky/tokei#124):

Currently it counts lines from all sources in repo, but I want to exclude example project
?exclude=example
or point tokei to specific directory
https://tokei.rs/{host: values: github|gitlab}/{Repo Owner eg: Aaronepower}/{Repo name eg: tokei}/{Directory eg: src}