[Feat] Try to add the feature that can manage links between each notes and combine it with mkdocs-network-graph-plugin

[virtualguard101]

The feature can link each notes that make your mkdocs-notebook more powerful!

This feature plans to implement these sub-feat:

• Underlying notes links system, which will be in core module
• A list shows the notes' forward links and inverse links which refer to other notes display at the head of each note pages
• Combine the feature with the plugin mkdocs-network-graph-plugin, which can display the interactive link gragh in each note pages
• [Option] Solve the problem that the link graph of each notes in Jupyter Notebook documentations cannot be displayed normally because of the the compatibility issues with the mkdocs-jupyter

[virtualguard101]

The feature in v2.1.0 has some issues on loading static resource (js, css), is now fixing.

[virtualguard101]

Through test using at my own wiki as a demo, the feature has confirmed that can be applied in mkdocs-based docs properly in v2.1.3 🎉. Thanks to the original project MkDocs Network Graph Plugin which inspired me and provides static resources (graph.js, graph.css)!

Some improvements will be arranged as appropriate in the future.