[documentation] add guide of issue types

[jwmueller]

Guide should be similar to the one in Datalab: https://docs.cleanlab.ai/master/cleanlab/datalab/guide/index.html

For each type of issue CleanVision can detect, should summarize:

1. how this issue is defined (and its quality-score)
2. example images with this issue
3. what are the implications of this issue if detected in your data and what actions can you take to mitigate
4. what optional parameters/arguments can you specify to exert greater control over the check for this issue type