Add spoiler tags (fixes #78)

Cargo.lock

@@ -1735,6 +1735,7 @@ dependencies = [
  "leptos_router",
  "log",
  "markdown-it",
+ "markdown-it-block-spoiler",
  "once_cell",
  "pretty_assertions",
  "rand",
@@ -2293,6 +2294,16 @@ dependencies = [
  "unicode-general-category",
 ]
 
+[[package]]
+name = "markdown-it-block-spoiler"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "008a8e4184fd08b5dca0f2b5b2ef8f126c1e83ca797c44ee41f8d7765951360c"
+dependencies = [
+ "itertools 0.13.0",
+ "markdown-it",
+]
+
 [[package]]
 name = "matchit"
 version = "0.7.3"

Cargo.toml

@@ -81,6 +81,7 @@ smart-default = "0.7.1"
 tower-layer = "0.3.3"
 katex = { version = "0.4", default-features = false }
 include_dir = "0.7.4"
+markdown-it-block-spoiler = "1.0.0"
 
 [dev-dependencies]
 pretty_assertions = "1.4.1"

src/backend/assets.rs

@@ -72,7 +72,7 @@ async fn serve_wasm() -> MyResult<impl IntoResponse> {
 
 #[debug_handler]
 async fn get_font(Path(font): Path<String>) -> MyResult<impl IntoResponse> {
-    let mut headers = HeaderMap::new();
+    let headers = HeaderMap::new();
     let font_dir = include_dir!("assets/fonts");
     let file = font_dir.get_file(font).ok_or(anyhow!("invalid font"))?;
     Ok((headers, file.contents()))

src/frontend/markdown.rs

@@ -33,6 +33,7 @@ fn markdown_parser() -> MarkdownIt {
     markdown_it::plugins::extra::strikethrough::add(&mut parser);
     markdown_it::plugins::extra::tables::add(&mut parser);
     markdown_it::plugins::extra::typographer::add(&mut parser);
+    markdown_it_block_spoiler::add(&mut parser);
     parser.inline.add_rule::<ArticleLinkScanner>();
     parser.inline.add_rule::<MathEquationScanner>();
     parser