Improve server side html sanitization.

server/src/bin/cleanhtml.rs

@@ -0,0 +1,16 @@
+use std::fs;
+
+use server::sanitize_html;
+
+fn main() -> anyhow::Result<()> {
+    let mut args = std::env::args().skip(1);
+    let src = args.next().expect("source not specified");
+    let dst = args.next().expect("destination not specified");
+    println!("Sanitizing {src} into {dst}");
+    let bytes = fs::read(src)?;
+    let html = String::from_utf8_lossy(&bytes);
+    let html = sanitize_html(&html)?;
+    fs::write(dst, html)?;
+
+    Ok(())
+}