chore(release): clean up repo for v0.0.1 release

Excluded from release bundle:
- CONTEXT.md, CHANGELOG.md (agent/project working notes)
- client-app/ (React Native messenger — tracked separately)
- contracts/hello_go/ (unused standalone example)

Kept contracts/counter/ and contracts/name_registry/ as vm-test fixtures
(referenced by vm/vm_test.go; NOT production contracts).

Docs refactor:
- docs/README.md — new top-level index with cross-references
- docs/quickstart.md — rewrite around single-node as primary path
- docs/node/README.md — full rewrite, all CLI flags, schema table
- docs/api/README.md — add /api/well-known-version, /api/update-check
- docs/contracts/README.md — split native (Go) vs WASM (user-deployable)
- docs/update-system.md — new, full 5-layer update system design
- README.md — link into docs/, drop CHANGELOG/client-app references

Build-time version system (inherited from earlier commits this branch):
- node --version / client --version with ldflags-injected metadata
- /api/well-known-version with {build, protocol_version, features[]}
- Peer-version gossip on dchain/version/v1
- /api/update-check against Gitea release API
- deploy/single/update.sh with semver guard + 15-min systemd jitter

client-app/tailwind.config.js

@@ -1,28 +0,0 @@
-/** @type {import('tailwindcss').Config} */
-module.exports = {
-  content: [
-    './app/**/*.{js,jsx,ts,tsx}',
-    './components/**/*.{js,jsx,ts,tsx}',
-    './hooks/**/*.{js,jsx,ts,tsx}',
-    './lib/**/*.{js,jsx,ts,tsx}',
-  ],
-  presets: [require('nativewind/preset')],
-  theme: {
-    extend: {
-      colors: {
-        // DChain brand — deep navy + teal accent
-        background:  '#0d1117',
-        surface:     '#161b22',
-        surfaceHigh: '#21262d',
-        border:      '#30363d',
-        primary:     '#2563eb',
-        primaryFg:   '#ffffff',
-        accent:      '#22d3ee',
-        muted:       '#8b949e',
-        destructive: '#f85149',
-        success:     '#3fb950',
-      },
-    },
-  },
-  plugins: [],
-};