feat(appkit): how to swap

[novusnota]

Closes #1857 (How-to for swaps with AppKit)
Closes #1986 (DeDust swap provider for AppKit)

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Reviewing files that changed from the base of the PR and between ad292f5 and 991689e.

📒 Files selected for processing (5)

• docs.json
• ecosystem/appkit/init.mdx
• ecosystem/appkit/overview.mdx
• ecosystem/appkit/swap.mdx
• ecosystem/appkit/toncoin.mdx

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[github-actions]

Thanks for the updates to ecosystem/appkit/swap.mdx: there are a couple of suggestions to make the swap execution examples safer to copy and run, so please apply the inline suggestions.