Initial RS-UV3A Starlight documentation site

Documentation for the HobbyPCB RS-UV3A tri-band FM transceiver board
covering 2m, 1.25m, and 70cm amateur radio bands.

Structure:
- Getting Started: quick start, connections, serial setup
- Guides: voice, packet/APRS, beacons, repeater/satellite, firmware
- Reference: specs, 66 serial commands, connector pinouts, hw revisions
- Accessories: RS-UVPA 5W power amplifier

Features:
- Ham radio green theme for readability
- Full command reference with categorization
- Searchable via Starlight/Pagefind
- Mobile responsive

astro.config.mjs

@@ -0,0 +1,86 @@
+// @ts-check
+import { defineConfig } from 'astro/config';
+import starlight from '@astrojs/starlight';
+
+// https://astro.build/config
+export default defineConfig({
+	telemetry: false,
+	devToolbar: { enabled: false },
+	integrations: [
+		starlight({
+			title: 'RS-UV3A',
+			description: 'Documentation for the HobbyPCB RS-UV3A VHF/UHF Tri-Band FM Transceiver',
+			logo: {
+				light: './src/assets/radio-light.svg',
+				dark: './src/assets/radio-dark.svg',
+				replacesTitle: false,
+			},
+			social: [
+				{
+					icon: 'external',
+					label: 'HobbyPCB Wiki',
+					href: 'https://sites.google.com/site/hobbypcbrsuv3awiki/'
+				},
+			],
+			customCss: ['./src/styles/custom.css'],
+			sidebar: [
+				{
+					label: 'Getting Started',
+					items: [
+						{ label: 'Introduction', slug: 'getting-started' },
+						{ label: 'Connections', slug: 'getting-started/connections' },
+						{ label: 'Serial Setup', slug: 'getting-started/serial-setup' },
+					],
+				},
+				{
+					label: 'Guides',
+					items: [
+						{ label: 'Voice Operation', slug: 'guides/voice-operation' },
+						{ label: 'Packet & APRS', slug: 'guides/packet-aprs' },
+						{ label: 'Beacon Operation', slug: 'guides/beacon-operation' },
+						{ label: 'Repeater & Satellite', slug: 'guides/repeater-satellite' },
+						{ label: 'Firmware Upgrade', slug: 'guides/firmware-upgrade' },
+					],
+				},
+				{
+					label: 'Reference',
+					items: [
+						{ label: 'Specifications', slug: 'reference/specifications' },
+						{
+							label: 'Commands',
+							collapsed: true,
+							items: [
+								{ label: 'Quick Reference', slug: 'reference/commands' },
+								{ label: 'Frequency', slug: 'reference/commands/frequency' },
+								{ label: 'Audio', slug: 'reference/commands/audio' },
+								{ label: 'Squelch & Tones', slug: 'reference/commands/squelch-tones' },
+								{ label: 'DTMF & CW', slug: 'reference/commands/dtmf-cw' },
+								{ label: 'Beacon', slug: 'reference/commands/beacon' },
+								{ label: 'Memory', slug: 'reference/commands/memory' },
+								{ label: 'I/O Control', slug: 'reference/commands/io-control' },
+								{ label: 'System', slug: 'reference/commands/system' },
+							],
+						},
+						{ label: 'Connectors', slug: 'reference/connectors' },
+						{ label: 'Hardware Revisions', slug: 'reference/hardware-revisions' },
+					],
+				},
+				{
+					label: 'Accessories',
+					items: [
+						{ label: 'RS-UVPA Power Amp', slug: 'accessories/rs-uvpa' },
+					],
+				},
+			],
+			head: [
+				{
+					tag: 'meta',
+					attrs: {
+						name: 'keywords',
+						content: 'RS-UV3A, HobbyPCB, ham radio, amateur radio, FM transceiver, VHF, UHF, 2m, 70cm, 1.25m, Arduino',
+					},
+				},
+			],
+		}),
+	],
+});