docs: make rollup stack menu more clear

[jcstein]

something like this:

Rollup Stacks

• Overview

  • Introduction to rollups on Celestia
  • Choosing your rollup stack

• Using Celestia as DA Layer

  • EVM Rollups
  • Arbitrum
  • Optimism
  • Ethereum Fallback Mechanism
  • Deployed rollups
  • Eclipse (SVM)
  • Movement (MoveVM)

• Building on Celestia

  • Sovereign Rollups
  • Rollkit
  • Sovereign SDK
  • Settled Rollups
  • Astria

• Cross-Chain Infrastructure

  • Blobstream
  • Blobstream X
  • SP1 Blobstream

[Ferret-san]

• I would move Astria into a different subcategory, or its own
• Dymension wouldn't be under the settled rollups here imo since its is own thing that does not settle to Celestia

[jcstein]

what category would astria fit under? ASS layers? lol