Explain NeoHaskell through commands, events, and views

[NickSeagull]

Summary

• center the landing page on NeoHaskell's Command → Decision → Event → Query application model
• add visual explanations for retained history, executable foundations, and additive behavior slices
• show how hidden dependencies accumulate rework and how Event Modeling keeps change organized around visible slices
• remove the standalone support page and replace its navigation and call to action with GitHub
• update the site description to match the application-model pitch

Verification

• corepack yarn typecheck
• corepack yarn build
• git diff --check
• desktop and enlarged-layout visual review in Safari
• preview verified at http://corthan.tail78a30.ts.net:4343/