Branding: add README header logo and DX user-facing naming (#11)

* Branding: add header logo and use DX in user-facing README copy

* Branding: remove namespace from title and include logo concepts HTML

* Branding: replace README header PNG with logo asset from concepts

* Branding: set solid white background for README logo lockup

* Branding: switch header logo wordmark to DX Telemetry

* Branding: update clientside header to DX logo lockup

* Docs: move full logo concepts HTML into docs/branding

* Tests: update AppShell header assertion for DX logo branding

* Branding: update logo tagline to 'Observe, Optimize, Deliver'

---------

Co-authored-by: Joel Dickson <joel@users.noreply.github.com>

Author: joeldickson

README.md

@@ -1,6 +1,10 @@
-# Agoda.DevExTelemetry
+<p align="center">
+  <img src="docs/assets/dx-telemetry-logo-header.svg" alt="DX Telemetry Manager logo" width="720" />
+</p>
 
-A full-stack developer experience telemetry dashboard that collects, stores, and visualizes build and test metrics from development tools.
+# DX Telemetry Manager
+
+A full-stack **DX telemetry** dashboard that collects, stores, and visualizes build and test metrics from development tools.
 
 This is an internal tool designed to be deployed within your organization's infrastructure. It receives telemetry from build plugins and test runners across your engineering teams, providing visibility into compile times, test pass rates, hot reload performance, and other developer productivity signals. It is **not** intended to be exposed to the public internet.