Finetuning the docs

[bbilly1]

Excellent work on this by @jonasrosland, this makes our docs much more professional.

A few notes of improvements:

• Annotations require an additional package, same functionality is also provided by Admonitions making development and deployment easier by reducing complexity.
• This loads google fonts automatically, deactivate them and substitute by our own locally loaded fontface definition.
• Move installation instructions to a top level nav point and split platform specific instructions to sub pages.
• Apply custom CSS to match with TA color scheme.

After that:

• Build and deploy, setup triggers to rebuild docs on merge on master.

[bbilly1]

That is now completed.