Add Open Graph image generation for all docs pages

Custom renderer with NASA-blue theme, Inter font, signal arc decoration.
Generates 1200x630 PNG per page at build time via astro-opengraph-images.
Head component injects og:image meta tag using getImagePath().

docs/astro.config.mjs

@@ -3,11 +3,15 @@ import { defineConfig } from 'astro/config';
 import starlight from '@astrojs/starlight';
 import icon from 'astro-icon';
 import rehypeMermaid from 'rehype-mermaid';
+import opengraphImages from 'astro-opengraph-images';
+import { render as ogRender } from './src/og-image.tsx';
+import * as fs from 'node:fs';
 
-// astro-opengraph-images installed but needs font setup:
-// import astroOpenGraphImages, { presets } from 'astro-opengraph-images';
+const interRegular = fs.readFileSync('node_modules/@fontsource/inter/files/inter-latin-400-normal.woff');
+const interBold = fs.readFileSync('node_modules/@fontsource/inter/files/inter-latin-700-normal.woff');
 
 export default defineConfig({
+  site: 'https://gr-apollo.l.warehack.ing',
   integrations: [
     icon(),
     starlight({
@@ -57,6 +61,25 @@ export default defineConfig({
         SocialIcons: './src/components/SocialIcons.astro',
       },
     }),
+    opengraphImages({
+      options: {
+        fonts: [
+          {
+            name: 'Inter',
+            weight: 400,
+            style: 'normal',
+            data: interRegular,
+          },
+          {
+            name: 'Inter',
+            weight: 700,
+            style: 'normal',
+            data: interBold,
+          },
+        ],
+      },
+      render: ogRender,
+    }),
   ],
   markdown: {
     rehypePlugins: [

docs/package-lock.json

@@ -16,6 +16,10 @@
         "mermaid": "^11.12.3",
         "rehype-mermaid": "^3.0.0",
         "sharp": "^0.34.2"
+      },
+      "devDependencies": {
+        "@fontsource/inter": "^5.2.8",
+        "react": "^19.2.4"
       }
     },
     "node_modules/@acemir/cssom": {
@@ -986,6 +990,16 @@
         "@expressive-code/core": "^0.41.6"
       }
     },
+    "node_modules/@fontsource/inter": {
+      "version": "5.2.8",
+      "resolved": "https://registry.npmjs.org/@fontsource/inter/-/inter-5.2.8.tgz",
+      "integrity": "sha512-P6r5WnJoKiNVV+zvW2xM13gNdFhAEpQ9dQJHt3naLvfg+LkF2ldgSLiF4T41lf1SQCM9QmkqPTn4TH568IRagg==",
+      "dev": true,
+      "license": "OFL-1.1",
+      "funding": {
+        "url": "https://github.com/sponsors/ayuhito"
+      }
+    },
     "node_modules/@fortawesome/fontawesome-free": {
       "version": "6.7.2",
       "resolved": "https://registry.npmjs.org/@fortawesome/fontawesome-free/-/fontawesome-free-6.7.2.tgz",

docs/package.json

@@ -18,5 +18,9 @@
     "mermaid": "^11.12.3",
     "rehype-mermaid": "^3.0.0",
     "sharp": "^0.34.2"
+  },
+  "devDependencies": {
+    "@fontsource/inter": "^5.2.8",
+    "react": "^19.2.4"
   }
 }

docs/src/components/Head.astro

@@ -2,7 +2,11 @@
 import type { Props } from '@astrojs/starlight/props';
 import Default from '@astrojs/starlight/components/Head.astro';
 import MermaidInit from './MermaidInit.astro';
+import { getImagePath } from 'astro-opengraph-images';
+
+const ogImageUrl = getImagePath({ url: Astro.url, site: Astro.site });
 ---
 
 <Default {...Astro.props}><slot /></Default>
+<meta property="og:image" content={ogImageUrl} />
 <MermaidInit />

docs/src/og-image.tsx

@@ -0,0 +1,114 @@
+import React from "react";
+import type { RenderFunctionInput } from "astro-opengraph-images";
+
+export async function render({
+  title,
+  description,
+}: RenderFunctionInput): Promise<React.ReactNode> {
+  return (
+    <div
+      style={{
+        height: "100%",
+        width: "100%",
+        display: "flex",
+        flexDirection: "column",
+        justifyContent: "space-between",
+        backgroundColor: "#0B1426",
+        padding: "60px 70px",
+        fontFamily: "Inter",
+      }}
+    >
+      {/* Signal arc decorations — top right */}
+      <svg
+        viewBox="0 0 200 200"
+        width="200"
+        height="200"
+        style={{ position: "absolute", top: "30", right: "50", opacity: 0.15 }}
+      >
+        <path
+          d="M40 180 Q100 60 160 180"
+          fill="none"
+          stroke="#FC3D21"
+          stroke-width="8"
+        />
+        <path
+          d="M70 180 Q100 90 130 180"
+          fill="none"
+          stroke="#FC3D21"
+          stroke-width="6"
+        />
+        <path
+          d="M90 180 Q100 120 110 180"
+          fill="none"
+          stroke="#FC3D21"
+          stroke-width="4"
+        />
+      </svg>
+
+      {/* Top: site name */}
+      <div
+        style={{
+          display: "flex",
+          alignItems: "center",
+          gap: "12px",
+          color: "#7EB8FF",
+          fontSize: 28,
+          fontWeight: 400,
+          letterSpacing: "0.05em",
+        }}
+      >
+        gr-apollo
+      </div>
+
+      {/* Middle: title + description */}
+      <div
+        style={{
+          display: "flex",
+          flexDirection: "column",
+          gap: "16px",
+          flexGrow: "1",
+          justifyContent: "center",
+        }}
+      >
+        <div
+          style={{
+            color: "#FFFFFF",
+            fontSize: 56,
+            fontWeight: 700,
+            lineHeight: 1.15,
+          }}
+        >
+          {title}
+        </div>
+        {description && (
+          <div
+            style={{
+              color: "#8BA4C4",
+              fontSize: 26,
+              fontWeight: 400,
+              lineHeight: 1.4,
+            }}
+          >
+            {description}
+          </div>
+        )}
+      </div>
+
+      {/* Bottom: tagline */}
+      <div
+        style={{
+          display: "flex",
+          justifyContent: "space-between",
+          alignItems: "center",
+          borderTop: "1px solid #1E3A5F",
+          paddingTop: "20px",
+          color: "#4A6A8A",
+          fontSize: 20,
+        }}
+      >
+        <span>Apollo Unified S-Band Decoder</span>
+        <span>GNU Radio 3.10+</span>
+      </div>
+    </div>
+  );
+}