CosmWasm core: Documentation outline

[aumetra]

Tracking issue for a basic outline of the documentation:

• [x] Installation
• [x] Entrypoints
  • [x] Overview
  • [x] Instantiate (#13)
  • [x] Execute (#13)
  • [x] Query (#13)
  • [x] Migrate (#13)
  • [x] Sudo (#13)
• [x] Architecture
  • [x] Actor model (#24)
  • [x] Events and attributes
  • [ ] Data
• [ ] Standard library
  • [x] Overview (#26)
  • [x] Math
    • [x] Overview (#33)
    • [x] Decimals
      • [x] Overview (#33)
    • [x] Integers
      • [x] Overview (#33)
  • [ ] Cryptography
    • [x] Overview (#26)
    • [ ] P256
      • [x] Overview (#26)
      • [ ] Key recovery example
      • [ ] Verification example
    • [x] K256 (#26)
    • [x] Ed25519 (#26)
    • [x] BLS12-381
      • [x] Overview (#26)
      • [ ] Hash-to-curve example
      • [ ] Point aggregation example
      • [ ] Pairing equality example
• [x] Advanced
  • [x] Overview (#35)
  • [x] Measuring time (#35)
• [ ] Specifications
  • [ ] Overview
  • [x] instantiate2 algorithm (see #30)

[aumetra]

The following things will only get a placeholder documentation until CW 2.1 is released:

• P256
• BLS12-381

Because we have no way to reliably doc-test them yet, and I would rather not have any examples instead of wrong ones.

[aumetra]

Other topics:

• Verifying the contract is well formed (cosmwasm-check)
• Page of best practices

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Should we show off how to do basic operations with CosmWasm utilities? Probably. Something like sending funds? Because we already kinda cover how to call other contracts.