General - Add resource monitor

[ReenigneArcher]

I would like to add a basic resource monitor the web ui of RetroArcher. The idea is to be something similar to what is shown in Plex's dashboard, but with relevant information related to RetroArcher.

Option 1:
Plotly

Option 2:
Pygal can help us generate the graphics as svg. These are interactive... Individual lines can be toggled on and off. Additionally you can hover over a point of interest to see the exact value.

This is a basic tutorial for using pygal. Note that the javascript file urls need to be changed to 'github.io' instead of 'github.com'. https://towardsdatascience.com/interactive-data-visualization-in-python-with-pygal-4696fccc8c96

And from the pygal documentation; how to embed directly in the html code

[github-actions]

This feature has been added and will be available in the next release.