Replace tidy with superhtml as HTML validator (#21664)

Also add `$HOME/local/bin` to `PATH` in linux CI

ci/aarch64-linux-release.sh

@@ -12,7 +12,7 @@ CACHE_BASENAME="zig+llvm+lld+clang-$TARGET-0.14.0-dev.1622+2ac543388"
 PREFIX="$HOME/deps/$CACHE_BASENAME"
 ZIG="$PREFIX/bin/zig"
 
-export PATH="$HOME/deps/wasmtime-v10.0.2-$ARCH-linux:$PATH"
+export PATH="$HOME/deps/wasmtime-v10.0.2-$ARCH-linux:$HOME/local/bin:$PATH"
 
 # Make the `zig version` number consistent.
 # This will affect the cmake command below.
@@ -62,7 +62,7 @@ stage3-release/bin/zig build test docs \
   -Dtarget=native-native-musl \
   --search-prefix "$PREFIX" \
   --zig-lib-dir "$PWD/../lib" \
-  -Denable-tidy
+  -Denable-superhtml
 
 # Ensure that stage3 and stage4 are byte-for-byte identical.
 stage3-release/bin/zig build \