[O] Generate a table of contents without exporting

[RG Williams]

Hi,
I know you can generate a table of contents when exporting, but can you do
it just within org? For context, I'm uploading an .org file to github and I
don't need to export it to another format because github recognizes and
displays it just fine. It's long so a ToC would be nice. Do I just have to
write it myself?