Adds some details to Python application stack
Some go tools and libraries
Fix typo in depeNdency
Adding CI and CD tools
Added some PaaS providers (hosted and open-source)

Also moved DO and Linode from PaaS to IaaS because those are basically IaaS, not PaaS.
Also amended text for internal services : they can be on premise but you can also use them to create your own public cloud.
Merge branch 'master' into adding-details

Conflicts:
	ci-servers.md
Merge branch 'jcbohin-adding-details'
removing tiny formatting issues in application stacks