Work with markdown files in GTK4

Billy Barrow 424c727cf5 Remove references to CMark namespece on public API 2 lat temu
src 424c727cf5 Remove references to CMark namespece on public API 2 lat temu
.gitignore ab05239787 Initial Commit 2 lat temu
test.md fb772b20a9 Embedded widget improvements 2 lat temu