feat: update use cases diagrams

[nikvoblikov]

This PR:

• Updates to diagrams for use cases;

Preview

• Preview Use cases page

Steps to test

• [x] Open the preview pages;
• [ ] Confirm that everything looks and works as expected;

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[xmulligan]

@prosazhin are we still waiting on something here? Or can you address the comments above?

[prosazhin]

@xmulligan Hi. We made changes to the comments. Please take a look.

[xmulligan]

@prosazhin They all look good now. Are you ready to merge?

[prosazhin]

@xmulligan We need more time for internal review. I will let you know when we can merge.

[prosazhin]

@xmulligan Done! You can merge now

[xmulligan]

Great, thanks!