DOCS: Minor fixes to readme, diagrams

[kishorereddy]

Overview

Minor updates to diagrams, readme, logo.

Ticket(s)

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Links(s)

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Dependencies

1. Removed arm64 for now, will add back in a follow up fix

Design

1. logo updated( slightly more consistent with fewer colors )
2. diagrams updated ( minor fixes )

Notes

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Pending

1. arm64 support

Tests

1. Minor update to the test to pass in phone value and updated message.