Fix up imports in main.py example

[IanWhalen]

Description

Removing import sys because it isn't used. adding imports for classes that are in fact used.

[CLAassistant]

All committers have signed the CLA.

[viambot]

Overall readability score: 54.49 (🟢 +0)

File	Readability
_index.md	54.02 (🟢 +0)

View detailed metrics

🟢 - Shows an increase in readability
🔴 - Shows a decrease in readability

File	Readability	FRE	GF	ARI	CLI	DCRS
_index.md	54.02	41.09	11.09	15.1	12.01	6.71
	🟢 +0	🟢 +0	🟢 +0	🟢 +0	🟢 +0	🟢 +0

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	54.49	45.91	10.88	13.35	11.87	7.77
	🟢 +0	🟢 +0	🟢 +0	🟢 +0	🟢 +0	🟢 +0

View metric targets

Metric	Range	Ideal score
Flesch Reading Ease	100 (very easy read) to 0 (extremely difficult read)	60
Gunning Fog	6 (very easy read) to 17 (extremely difficult read)	8 or less
Auto. Read. Index	6 (very easy read) to 14 (extremely difficult read)	8 or less
Coleman Liau Index	6 (very easy read) to 17 (extremely difficult read)	8 or less
Dale-Chall Readability	4.9 (very easy read) to 9.9 (extremely difficult read)	6.9 or less

[viambot]

You can view a rendered version of the docs from this PR at https://docs-test.viam.dev/981c6d20ff23a3af57d469428bd3fc532e52693f/public