Serving files is working

Right now we're not doing any streaming and this isn't ideal. I'll need
to figure it out at some point.

src/files.rs

@@ -9,7 +9,7 @@ pub fn list_files(dir: PathBuf) -> io::Result<Vec<PathBuf>> {
         .filter(|entry| is_image_or_video(&entry.path()) || entry.file_type().unwrap().is_dir())
         .map(|entry| entry.path())
         .map(|path: PathBuf| {
-            let relative = path.strip_prefix(std::env::current_dir().unwrap()).unwrap();
+            let relative = path.strip_prefix(dotenv::var("BASE_PATH").unwrap()).unwrap();
             relative.to_path_buf()
         })
         .collect::<Vec<PathBuf>>();