WIP: Add copy to sparse sections

[vindard]

Description

Case study pages

• [x] Case Studies
• [ ] Mobile
• [ ] Breez
• [ ] Muun
• [ ] Phoenix
• [ ] Blue Wallet
• [ ] Blixt Wallet
• [ ] Galoy

Other pages

• [ ] Payment Channels
• [ ] Mapping the Lightning Layers Model to LDK Architecture Re-organise into a sensible layout

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