Update to blogpost to include latest Value Stream Analytics screens and API documentation links

Why is this change being made?

The reader of this blog post can be benefit with the VSA screenshot from the platform, and also links to relevant reading material for DORA metrics and the API specifications. @hsnir1 suggested over Slack ( here and here), that this would be a good addition to this blogpost. We discussed the same and decided we can add the image and the documentation links into the existing copy as in this MR.

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