(GENERAL) Rethink diagramming tool

[patrykorwat]

Currently https://github.com/mingrammer/diagrams tool is being used for diagrams, which is a free, easy to use and extensive library. Although, during development of the cloudiscovery, we face the following issues with it:

1. Security Groups, VPCs and other resources cannot be represented as areas, making diagrams more complex because of a need of edges to represent relations between resources (instead of just a placement of a resource in a designated area). Related issue: Add Security Groups for AWS mingrammer/diagrams#162
2. Usage of graphviz engine - although it is good for scientific documents, its UX is disputable. The project tweaks this engine (see Allow using different graphviz engines mingrammer/diagrams#193) but the visualizations are worse in quality than commercial tools.\

The task is to think about ways to have good diagrams.

[patrykorwat]

The best option will be to generate diagrams.net compatible diagram files. It'll allow better interoperability and enable users to work on the generated diagrams.