chore: update TC AITech unit

[Chef-Yogi]

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PR-Codex overview

This PR updates the TradingCompetition component to modify the reward unit from dollars ($) to AITECH, reflecting a change in the type of reward for the trading competition.

Detailed summary

• Changed the unit value from '$' to 'AITECH' in the reward configuration.
• Updated the URL for the trading competition article to ensure it points to the correct resource.

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