Add additional SSH information to `ssh-into-snowy.md`
Add additional SSH information to `ssh-into-snowy.md`

* Add section listing how to connect to lab machines
* Add example SSH config at bottom
* Add additional resources section linking to IT resources

cssbristol/cssbristol.github.io,cssbristol/cssbristol.github.io,cssbristol/cssbristol.github.io,cssbristol/css-website-2015,cssbristol/cssbristol.github.io,cssbristol/cssbristol.github.io