doc: Move Thingy:91 and Thingy:91 x under application development

[divipillai]

Moved Thingy:91 and Thingy:91 x under application development.

NCSDK-29643

[NordicBuilder]

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Build number: 12

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Enabled	Name	Description
	ci-disabled	Disable the ci execution
	ci-all-test	Run all of ci, no test spec filtering will be done
	ci-force-downstream	Force execution of downstream even if twister fails
	ci-run-twister	Force run twister
	ci-run-zephyr-twister	Force run zephyr twister

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Test Spec & Results: ✅ Success; ❌ Failure; 🟠 Queued; 🟡 Progress; ◻️ Skipped; ⚠️ Quarantine

• ◻️ Toolchain
• ◻️ Build twister
• ◻️ Integration tests

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[NordicBuilder]

You can find the documentation preview for this PR at this link. It will be updated about 10 minutes after the documentation build succeeds.

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[greg-fer]

Checked the doc preview and it looks OK!

[divipillai]

@gmarull : The compliance error is because of the image size of existing images. I think we could override this compliance check?