Instead of hardcoding for reference or linked sources, update site to use dynamic content

To enable easy updating and dynamic rendering instead of having to Issues/PR/Merge to update referenced or redirected content to be stored data in Firebase.

An example of this can be seen on the [Flutteristas conference website](https://flutteristas.org/flutteristas-conference). Source code can be found on the Flutteristas [website repo](https://github.com/TheFlutteristas/flutteristas_website/tree/main/lib). The site uses [models](https://github.com/TheFlutteristas/flutteristas_website/tree/main/lib/models) and data pulls for [page content](https://github.com/TheFlutteristas/flutteristas_website/tree/main/lib/pages/conference).