Afrique, Gahuza and Persian nav updates

[jordit]

Resolves JIRA n/a

Overall changes

• Adds RDC conlfict topic links to the navigation bar of Afrique and Gahuza
• Removes US election topic from Persian's navigation bar

Code changes

• Edited Navigation section of src/app/lib/config/services/afrique.ts to add RDC conflict topic link in second position
• Edited Navigation section of src/app/lib/config/services/gahuza.ts to add RDC conflict topic link in second position
• Edited Navigation section of src/app/lib/config/services/persian.ts to add US election topic link from thirsd position

Testing

1. Open Afrique's front page, second link in the nav should be Conflit en RDC 2024 and open /afrique/topics/cge72ry253jt
2. Open Afrique's front page, second link in the nav should be Ibitero bya M23 muri Congo 2024 and open /gahuza/topics/cx2qn9pqx4yt
3. Open Persian's front page انتخابات آمریکا should not longeer appear in third position

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