Fix LaunchingInstances.md in 02-logging-onto-cloud.md for aio.html

[annajiat]

In https://datacarpentry.org/cloud-genomics/02-logging-onto-cloud/index.html
"launching cloud instances on your own" links to
https://datacarpentry.org/cloud-genomics/LaunchingInstances/

using [launching cloud instances on your own](../LaunchingInstances/)

which is https://github.com/datacarpentry/cloud-genomics/blob/gh-pages/_extras/LaunchingInstances.md

but the preceding ".." in the link causes the link to break in https://datacarpentry.org/cloud-genomics/aio.html
where the link gets changed to
https://datacarpentry.org/LaunchingInstances/
which does not exist.