Adjust main menu: rename UDFs and position as 6th item

[Copilot]

Rename the UDFs menu item and reposition it to appear immediately after Data types.

Changes

• Shortened title from "UDFs - User Defined Functions" to "UDFs" in /udfs/index.md
• Added nav_order: 6 to position UDFs between Data types (5) and Cypher Language (7)

Menu order now: Home → Getting Started → Commands/Algorithms → Data types/Integration → UDFs → Cypher Language → GenAI Tools...

Original prompt

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This section details on the original issue you should resolve

<issue_title>adjust main menu</issue_title>
<issue_description>1. Rename [UDFs - User Defined Functions] to UDFs
2. UDFs should be the 6th item menu right below Data types.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes adjust main menu #308

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