Gravizo service down, affecting documentation block diagram

[xiashtra]

Description

The Gravizo service appears to be down, impacting documentation where used for block diagrams.

Additional Details / Steps to Reproduce

Ref data flow block diagram which should be here: https://github.com/OverlayPlugin/cactbot/blob/main/docs/LogGuide.md#data-flow

We should pick an alternate solution, preferably one that doesn't require an external service.

Cactbot Module

Other

Configuration Info

N/A

Log & Screenshots

N/A

Confirmation

• I reviewed Common Issues and Workarounds and verified that my settings are correct.
• I used the search function to confirm this issue doesn't already exist.

[Bing-su]

Since GitHub supports Mermaid, how about using Mermaid?
https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-diagrams