Update documentation screeenshots & output examples

[fornellas]

Since it was written we have:

• Better stack trace line removal (shorter output).
• Better trimming of path prefixes.
• Colored stack traces.

Let's make this visible both at README.md and Sphinx docs.

[aryasoni98]

Could I work on this?

[deathowl]

@aryasoni98 Yes. if you could, that would be lovely