Strip trailing slash from the blog URL

src/scriptorium/defaults.gleam

@@ -2,6 +2,7 @@
 //// blog quickly.
 
 import gleam/uri
+import gleam/string
 import scriptorium/compiler
 import scriptorium/config.{type Configuration, Compiling, Configuration, Rendering}
 import scriptorium/parser
@@ -34,6 +35,14 @@ pub fn default_config(
   author: config.Author,
   copyright: String,
 ) -> Configuration {
+
+  // Drop any trailing slash from the blog URL, otherwise a `blog_url` like
+  // "https://my.blog.example/" will end up having a root path of "/" instead
+  // of "".
+  let blog_url = case string.ends_with(blog_url, "/") {
+    True -> string.drop_right(blog_url, 1)
+    False -> blog_url
+  }
   let assert Ok(parsed_url) = uri.parse(blog_url)
 
   Configuration(