docs: refine TDX iApp guide content

- Removed redundant section on understanding TDX concepts to streamline the guide.
- Updated formatting for clarity and consistency.

Author: Le-Caignec

src/guides/build-iapp/advanced/build-your-first-tdx-iapp.md

@@ -19,15 +19,11 @@ instabilities, limited compatibility, and potential outages.
 
 :::
 
-:::info Understanding TDX Concepts
-
 Before implementing TDX, make sure you understand the foundational concepts and
 differences between TEE technologies. Check out our
 **[Intel TDX Technology](/get-started/protocol/tee/intel-tdx)** guide for
 comprehensive explanations of TDX technology and its benefits.
 
-:::
-
 ::: info
 
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