Add troubleshooting guide in a flowchart format

[sabbyanandan]

Flowcharts are a better approach to unpack complex scenarios, especially with conditions. That conditionality is always the case when it comes to troubleshooting and debugging.

Mermaid is a tool that is commonly adopted to describe the guide in a markdown format, and it then translates it to visual charts. Mermaid recently also made it into GitHub proper! However, the Docusaurus support is prioritized and still pending.

As a continuation of #86, anything that pertains to troubleshooting can choose this format to explain the steps more visually to readers (i.e., developers).

Here's an example that uses Mermaid to describe the troubleshooting procedure.

[sabbyanandan]

cc: @rafaelcr