Add flow diagrams to all package getting started pages

- Added get-it-flow.svg to get_it getting started
- Added watch-it-flow.svg to watch_it getting started
- Added command-it-flow.svg to command_it getting started
- Consistent with listen_it which already has listen-it-flow.svg
- Visual diagrams help explain data flow in each package

Author: escamoteur

docs/documentation/command_it/getting_started.md

@@ -17,6 +17,8 @@ This documentation is currently being restructured and will soon match the compr
 
 command_it is a way to manage your state based on `ValueListenable` and the `Command` design pattern. Sounds scary uh? Ok lets try it a different way. A `Command` is an object that wraps a function that can be executed by calling the command, therefore decoupling your UI from the wrapped function.
 
+![command_it Data Flow](/images/command-it-flow.svg)
+
 It's not that easy to define what exactly state management is (see https://medium.com/super-declarative/understanding-state-management-and-why-you-never-will-dd84b624d0e ). For me it's how the UI triggers processes in the model/business layer of your app and how to get back the results of these processes to display them. For both aspects `command_it` offers solution plus some nice extras. So in a way it offers the same that BLoC does but in a more logical way.
 
 >This readme might seem very long, but it will guide you easily step by step through all features of `command_it`.

docs/documentation/get_it/getting_started.md

@@ -29,6 +29,8 @@ next:
 - Manage app-wide state (view models, managers, BLoCs)
 - Easily swap implementations for testing
 
+![get_it Data Flow](/images/get-it-flow.svg)
+
 > Join our support Discord server: [https://discord.gg/ZHYHYCM38h](https://discord.gg/ZHYHYCM38h)
 
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docs/documentation/watch_it/getting_started.md

@@ -27,6 +27,8 @@ next:
 - Navigate or show dialogs in response to data changes
 - Display command progress (loading spinners, error messages, success states)
 
+![watch_it Data Flow](/images/watch-it-flow.svg)
+
 > Join our support Discord server: [https://discord.gg/ZHYHYCM38h](https://discord.gg/ZHYHYCM38h)
 
 ---