docs(python): Update Python main quick start guide

[inventarSarah]

DESCRIBE YOUR PR

This branch contains the updated Python quick start guide.
Most important updates:

• updated to split layout
• added callout at the top to guide users to the integration page if they use a framework
• added poetry install command (as seen in the guide in Sentry)
• added Metrics onboarding option (as seen in the guide in Sentry)
• added "instrumenting your app" section -> hope I got the bit about creating transactions right - lmk
• added verify examples for tracing, logs, metrics
• added profiling callout to warn users about the different profiling modes
• extended Next Steps section

Closes: #18364

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