Documentation link fixed.
Thx!

Add database shape

Add the ability to use the PlantUML `database` shape for systems (including
external systems), containers, and components. The following macros have
been added:

- `SystemDb`
- `SystemDb_Ext`
- `ContainerDb`
- `ComponentDb`

These macros take the same parameters as their regular counterparts.

Add missing comma in vscode snippets

Add enterprise boundaries

Bigger title, smaller type indicator looks better than everything just
being plain bold text on the boundary border.

Adds a new `Enterprise_Boundary` macro based on the system landscape
diagram type from the C4 model (the so-called "Level 0"). Also includes an
example system landscape diagram.

Avoid duplication and allow for easier label adjustments by using the base
`Boundary` macros in `System_Boundary` and `Container_Boundary`.

Added C4 Context and Component Diagrams, split all abstractions into different files

updated styles to be flat
boundary is now a dashed rectangle
updated README with new image urls

This reverts commit bdc03b9a.

new samples using the new types

add licence

more relationship helper methods