Fix markdown list formatting

[alexbainter]

We thought this was an issue with the markdown (dtinit/portability-articles#29) but it wasn't fixed by dtinit/portability-articles#64 so it must be something to do with our markdown to HTML process

How it should look:

[aaronjae22]

It's already looking like that in the portability articles repo though.

[alexbainter]

@aaronjae22 Right, but that's using GitHub's markdown display which is working properly. On https://portmap.dtinit.org/articles/photos2.md/ it's not displaying correctly, so there must be some difference between Github's markdown implementation and ours

[alexbainter]

Another example:

[aaronjae22]

Ohh, you're absolutely right. It works fine in GitHub but Portmap does not display it as expected