refactor(scripts): combine OG image generation scripts

Merge generate-projects-og.js into generate-page-og.js to create a
single unified script for all page OG images (home, blog, categories,
projects). Run with `npm run cover:page-og [page]` or `npm run
cover:page-og all` to generate specific or all page images.

Author: CalvinAllen

package.json

@@ -12,7 +12,7 @@
     "new:project": "node scripts/new-project.js",
     "cover": "node scripts/generate-cover.js",
     "cover:project": "node scripts/generate-project-cover.js",
-    "cover:projects-og": "node scripts/generate-projects-og.js",
+    "cover:page-og": "node scripts/generate-page-og.js",
     "copy-originals": "node scripts/copy-originals.js",
     "fetch:stats": "node scripts/fetch-project-stats.js"
   },