Use object pooling with up to 45 threads for improved parallelization in markdown rendering.
Reviewed-on: https://codeberg.org/gitnex/GitNex/pulls/890
Reviewed-by: M M Arif <mmarif@noreply.codeberg.org>
Co-Authored-By: opyale <opyale@noreply.codeberg.org>
Co-Committed-By: opyale <opyale@noreply.codeberg.org>